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Indigo Partners, LLC[1] is an American private equity firm which has a controlling interest in the American Frontier Airlines and Chilean low-cost JetSmart, as well as holding stakes in Mexican budget airline Volaris and European (Hungarian) low-cost carrier Wizz Air. The company had a partnership with Enerjet when it launched the now defunct Canadian ultra-low-cost carrier Lynx Air.[2]

Key Information

Indigo Partners was founded by Bill Franke and has set up a number of ultra-low-cost airlines around the world. It is headquartered in Phoenix, Arizona.[3]

History

[edit]

At the November 2017 Dubai Air Show, Indigo Partners signed a memorandum of understanding for 430 Airbus Aircraft: 273 A320neos and 157 A321neos for $49.5 billion at list prices: 146 aircraft will go to Wizz Air, 134 to Frontier Airlines, 80 to Volaris and 70 to JetSmart.[2] Wizz will get 72 A320neo and 74 A321neo, Frontier 100 A320neo and 34 A321neo, Volaris 46 A320neo and 34 A321neo and JetSmart 56 A320neo and 14 A321neo.[4]

Deliveries will begin in 2021, most will be delivered in 2025-26 from Toulouse, France and Mobile, Alabama, U.S. Wizz Air previously ordered 110 A321neos at the 2015 Paris Airshow and its fleet will grow to 300 aircraft by 2025. Frontier received its first Airbus from Mobile in 2018 and its fleet will triple to 200, flying 50 million passengers in 2026.[5]

On November 29, 2018, Indigo Partners reached a preliminary agreement to buy Icelandic low-cost carrier WOW Air after Icelandair Group dropped its takeover.[6] However, on March 22, 2019, it was announced that Indigo Partners withdrew its offer to buy Wow Air.[7]

On November 14, 2021, Indigo Partners ordered 255 A321s.[8]

In 2022, Indigo Partners attempted to merge its majority-owned Frontier subsidiary with fellow US-based low cost carrier Spirit Airlines.[9][10] The planned merger with Spirit fell apart as JetBlue offered an all-cash offer of $3.7 billion which was higher than Frontier's offer of more than $2.6 billion in stock and cash.[11]

Fleet

[edit]
Airline Airplane In
service 		Orders Country
Frontier Airlines Airbus A320 Family 121 219 United States
JetSmart 19 92 Chile
Volaris Airbus A320 Family 112 104 Mexico
Wizz Air 176 379 Hungary
Airbus A330 1 —

Further reading

[edit]

References

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Indigo Partners

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Indigo Partners, LLC is an American private equity firm founded in 2002 by William A. "Bill" Franke and headquartered in Phoenix, Arizona, specializing in investments within the air transportation industry, with a focus on ultra-low-cost carriers.[1][2] The firm is known for its strategy of acquiring and supporting budget airlines to achieve operational efficiencies and market expansion through aggressive cost management and fleet modernization.[3] Under Franke's leadership, Indigo Partners has built a portfolio centered on low-cost aviation, including a controlling interest in Frontier Airlines, the U.S.-based ultra-low-cost carrier that went public in 2021 with the firm retaining a significant voting stake of approximately 77% at the time.[1][4] It also maintains a majority ownership in JetSmart, Chile's largest low-cost airline serving South America, and holds a substantial stake of approximately 18% in Volaris, Mexico's leading ultra-low-cost carrier operating across North and Central America.[3][4][5] The firm has a significant stake of 24% in Europe's Wizz Air as of 2025, following historical investments that included progressive reductions through sales, such as a major disposal of half its holdings in 2021 valued at around 400 million pounds.[6][7] Indigo Partners has been instrumental in large-scale aircraft orders to support its portfolio, such as a landmark 2017 commitment for 430 Airbus A320neo-family jets across its airlines, one of the largest single orders in commercial aviation history at the time.[8] The firm has also pursued strategic initiatives like the attempted 2022 merger between Frontier and Spirit Airlines, valued at $2.9 billion, aimed at creating a dominant U.S. low-cost operator, though the deal was ultimately abandoned due to regulatory challenges; a subsequent proposal in January 2025 valued at $2.1 billion was rejected by Spirit.[3][9][10] In April 2024, Indigo completed the distribution of approximately 41 million shares of Frontier Group Holdings to its limited partners, including Franke, reducing its direct ownership but maintaining a controlling interest, as part of ongoing portfolio management.[2]

Background

Founding and Leadership

Indigo Partners was established in 2002 by William A. "Bill" Franke, a seasoned private equity investor and former airline executive who had previously served as chairman of America West Airlines from 1992 to 2001 and chief executive officer from 1993 to 2001.[1][11] Franke founded the firm to focus on investments in the aviation sector, leveraging his extensive experience in low-cost carrier operations and airline turnarounds to identify opportunities in air transportation.[12] From its inception, Indigo Partners operated as a private equity firm specializing in strategic acquisitions and investments aimed at enhancing efficiency and growth in the global airline industry.[2] Franke has remained the managing partner since the firm's founding, guiding its investment strategy with a hands-on approach informed by decades in aviation finance and operations.[13] His leadership emphasizes disciplined capital allocation and operational improvements in portfolio companies, drawing on his prior roles that included transforming struggling airlines into profitable entities. Franke's personal net worth was estimated at $1.3 billion as of February 2025.[14] Other key executives include Andrew S. Broderick, a managing director who joined in 2008 and oversees investment analysis and deal execution, bringing expertise in financial structuring for aviation assets.[15] Brian Franke, a principal since 2004, supports portfolio management and serves on boards of several investee airlines, contributing to strategic oversight.[16] The firm is headquartered in Phoenix, Arizona, where Franke previously led America West, allowing Indigo Partners to maintain close ties to the U.S. aviation hub and facilitate efficient operations across its global investments. This location supports the leadership team's collaborative decision-making and proximity to key industry stakeholders in the Southwest.[17] As of 2025, the core leadership structure remains stable, with Franke at the helm and a lean team of aviation specialists driving the firm's focus on value creation in air transportation.[18]

Organizational Structure

Indigo Partners LLC operates as a private limited liability company structured as a private equity firm, with no public listing on any stock exchange. Ownership is held privately, primarily by its founders and key partners, including managing partner William A. Franke and principal Brian Franke.[19][16] The firm maintains a lean organizational framework, employing around 9 professionals to support its operations in the aviation sector. Core divisions include an investment team focused on sourcing and executing deals, a finance team led by Director Lynne Langelo for financial oversight, and integrated legal and compliance functions to manage regulatory requirements and risk.[20][21] As of 2024, Indigo Partners manages approximately $4.6 billion in assets under management, concentrated exclusively on aviation-related investments.[22] Indigo Partners collaborates with external advisors for specialized expertise and co-investors to facilitate larger transactions, such as its partnership with the International Finance Corporation in funding Cebu Pacific's recovery efforts.[23]

Investment Portfolio

Current Holdings

Indigo Partners maintains majority stakes in two ultra-low-cost carriers: Frontier Airlines in the United States and JetSmart in Chile. The firm acquired Frontier Airlines in 2013 and currently holds approximately 80% of its outstanding shares through affiliated investment funds, a position that has enabled significant influence over strategic decisions and contributed to the airline's valuation growth to around $1.0 billion as of mid-2025.[24] In March 2024, Indigo announced plans to distribute shares of Frontier Group Holdings to its limited partners while retaining significant voting control.[2] William A. Franke, Indigo Partners' managing partner, serves as chairman of Frontier's board, providing direct oversight on governance and operations.[15] For JetSmart, Indigo Partners established a controlling interest in 2019, with an estimated majority ownership exceeding 50%, bolstered by a minority investment from American Airlines in 2021 that enhanced network partnerships without diluting Indigo's primary control.[25] This stake has supported JetSmart's rapid expansion across South America, driving its fleet to over 40 aircraft as of late 2024.[26] Indigo representatives hold board seats, guiding the carrier's ultra-low-cost model amid regional growth opportunities. Among its minority stakes, Indigo Partners owns about 18.2% of Volaris, Mexico's leading low-cost airline, as of 2024, a position that has yielded substantial returns through the carrier's IPO and subsequent expansions, with the stake valued at roughly $140 million as of late 2025 based on Volaris' market cap.[5][27] This investment includes board representation for Indigo, allowing input on fleet modernization and route development. Similarly, the firm holds a 24% stake in Europe's Wizz Air as of June 2025, following a 9% divestiture earlier in the year that realized approximately $555 million in proceeds while retaining significant influence.[7][28] Indigo's board presence at Wizz Air supports its aggressive growth strategy, with the stake contributing to a portfolio valuation uplift amid the airline's order of over 100 new aircraft. Recent developments include ongoing discussions in 2025 regarding a potential acquisition of Spirit Airlines by Frontier, amid Spirit's Chapter 11 bankruptcy filing in August 2025, though no deal has been finalized as of November.[29][30] These talks reflect Indigo's continued pursuit of consolidation opportunities in the U.S. low-cost sector.

Past Investments

Indigo Partners' early investments in the aviation sector included a significant stake in Spirit Airlines, acquired in July 2006 through a recapitalization deal valued at approximately $150 million in cash and other considerations, which gave the firm a controlling interest in the then-struggling carrier.[31] Under Indigo's influence, Spirit transitioned into an ultra-low-cost carrier (ULCC) model, emphasizing ancillary revenues and operational efficiencies, which led to four consecutive years of profitability by 2012.[32] The firm fully exited its position in July 2013 by selling 12.07 million shares in a public offering priced at around $32 per share, generating proceeds of approximately $392 million and yielding a profit of roughly $200 million after accounting for the initial investment and subsequent capital infusions.[33][34] This exit allowed Indigo to realize substantial gains from the ULCC transformation while freeing capital for new opportunities, such as the acquisition of Frontier Airlines later that year, highlighting a strategy of cycling investments into higher-growth prospects.[35] Another key early investment was in Tiger Airways, a Singapore-based low-cost carrier, where Indigo held a 24% stake prior to the airline's 2010 initial public offering (IPO).[36] Through the IPO, which raised S$248 million (about $178 million USD) at S$1.50 per share, Indigo sold 5.8% of its stake, netting up to S$16 million (approximately $11 million USD) in proceeds as part of a broader vendor share allocation.[36][37] This partial exit provided profit realization on the initial investment made in the mid-2000s, while retaining a reduced 14.5% holding to benefit from Tiger's expansion in Southeast Asia; however, Indigo eventually divested its remaining stake as part of a shift toward markets with stronger ULCC potential.[36] Indigo also pursued opportunities in emerging markets with a 49% stake in Indonesia's Mandala Airlines, acquired in October 2006 to convert the full-service carrier into a low-cost model amid rapid regional growth.[38] Despite initial progress, including fleet modernization and route expansion, Mandala faced persistent losses due to intense competition, regulatory hurdles, and economic volatility in Indonesia, leading to bankruptcy filing and cessation of operations in July 2014.[39] The wind-down resulted in no significant financial returns and underscored lessons for Indigo on the risks of ULCC models in fragmented, high-regulation environments, prompting a refined focus on more stable geographies for future investments.[38] Pre-2010, Indigo's portfolio was predominantly aviation-focused, with no major non-aviation deals identified, reflecting the firm's foundational emphasis on airline incubation and operational turnarounds.[40] Overall, these exits demonstrated Indigo's investment philosophy of entering undervalued carriers, implementing cost discipline to drive profitability, and divesting upon achieving scale—often post-IPO or stabilization—to redeploy capital, though outcomes varied by market maturity and execution challenges.[40]

History

Early Development (2002–2010)

Indigo Partners, founded in 2002 by William A. Franke, a veteran airline executive with prior leadership at America West Airlines, began operations amid the lingering effects of the post-9/11 aviation industry contraction, which had led to widespread airline bankruptcies and reduced passenger demand across the sector.[41] In its initial years from 2003 to 2005, the firm focused on securing early capital commitments from limited partners to pursue opportunistic investments in the recovering air transportation market, emphasizing low-cost carriers in emerging regions. A pivotal early move was the 2004 investment in Wizz Air, a Hungarian-based ultra-low-cost carrier targeting Eastern Europe, marking Indigo's entry into international LCC development with a strategy centered on high-growth, underserved markets.[1] This stake helped Wizz Air expand rapidly post-launch, aligning with Indigo's thesis of backing lean operations to capture rising demand in post-communist economies.[42] The firm's aviation focus solidified in 2006 with its acquisition of a majority controlling interest in Spirit Airlines, a Florida-based low-cost operator, through a recapitalization that injected approximately $150 million in cash and other considerations, replacing prior investor Oaktree Capital Management.[31] This deal, completed in July 2006, positioned Indigo to influence Spirit's transformation into an ultra-low-cost model, including fare unbundling and route optimization to improve margins amid competitive pressures.[43] However, the period was marked by significant challenges, including the ongoing post-9/11 recovery, where U.S. airlines faced heightened security costs and a 20-30% drop in enplanements from 2000 levels, constraining investment opportunities. By mid-decade, Indigo navigated these hurdles by prioritizing resilient LCC structures less vulnerable to legacy cost burdens. The 2008 global financial crisis and associated jet fuel price surge—peaking at over $140 per barrel in July—intensified pressures on Indigo's portfolio, as volatile energy costs eroded profitability for fuel-intensive carriers like Spirit and Wizz Air, contributing to industry-wide losses exceeding $10 billion in 2008. Indigo responded by deepening operational involvement, advising on cost controls such as hedging and fleet efficiency to mitigate volatility. By 2008-2010, these experiences refined the firm's investment thesis toward scalable ultra-low-cost models, culminating in a 2010 investment as part of a group acquiring a 50% stake in Mexico's Volaris, with Indigo holding approximately 26%, for strategic growth in Latin America, establishing Indigo as a dedicated global aviation investor with a portfolio emphasizing disciplined expansion over short-term gains.[44] This period laid the groundwork for Indigo's emphasis on partnering with management to drive ancillary revenue and network density in high-potential markets.

Major Expansions (2011–Present)

In 2013, Indigo Partners significantly expanded its portfolio by acquiring Frontier Airlines from Republic Airways Holdings in a transaction valued at $145 million, comprising $36 million in cash and the assumption of approximately $109 million in debt.[45] This move marked Indigo's entry into the U.S. ultra-low-cost carrier market, providing a platform for operational efficiencies and fleet modernization under the firm's influence.[46] Indigo exited its investment in Spirit Airlines in 2013 by selling its shares.[47] Throughout the 2010s, Indigo deepened its involvement in Volaris, Mexico's leading low-cost airline, following an initial stake acquired in 2010. The firm increased its ownership between 2013 and 2016, reaching approximately 15.9% by 2017 through participation in Volaris's 2013 initial public offering on the New York Stock Exchange and subsequent investments that supported route expansion into the U.S. and Central America.[48][49] Indigo's long-standing investment in Wizz Air continued, with the firm retaining a substantial stake of 19.6% following Wizz Air's 2015 London Stock Exchange IPO, leveraging it to fuel the carrier's growth across Eastern and Western Europe.[50][51] The firm's expansion into South America began in 2017 with the launch and controlling investment in JetSmart, Chile's ultra-low-cost carrier, enabling the airline to launch international routes to Peru, Argentina, and Colombia while securing orders for long-range Airbus A321XLR aircraft.[52][53] The COVID-19 pandemic severely disrupted Indigo's portfolio airlines in 2020, with grounded fleets and revenue losses exceeding 80% for carriers like Frontier and Volaris, prompting cost-cutting measures such as deferred aircraft deliveries and furloughs.[54] Recovery strategies emphasized the resilience of the ultra-low-cost model, including targeted cash preservation—Frontier achieved breakeven cash flow by mid-2021—and accelerated fleet renewals with fuel-efficient aircraft to capture pent-up demand.[55] By 2022, Indigo's airlines had restored over 90% of pre-pandemic capacity, supported by government aid and strategic partnerships. In March 2024, Indigo announced plans to distribute shares of Frontier Group Holdings to its limited partners, reducing direct ownership while maintaining influence.[2] In the 2024–2025 period, Indigo pursued further consolidation through Frontier's renewed merger proposals for Spirit Airlines, including an initial January 2025 offer valued at approximately $2.6 billion, comprising $400 million in debt and a 19% equity stake in Frontier, aimed at creating a major U.S. low-cost carrier. The proposal was rejected by Spirit amid its bankruptcy proceedings. In November 2025, Spirit filed for Chapter 11 bankruptcy for the second time, with informal merger discussions between Frontier and Spirit ongoing but no deal finalized as of that date.[56][57][58] These expansions transformed Indigo Partners from a U.S.-centric investor into a global player spanning the Americas and Europe, with portfolio airlines operating approximately 350 aircraft and serving more than 200 destinations as of 2025.[59]

Business Strategy

Investment Philosophy

Indigo Partners' investment philosophy centers on the ultra-low-cost carrier (ULCC) model, which prioritizes aggressive cost discipline to achieve high operating margins and scalability in the aviation sector. Founded by William A. Franke in 2002, the firm views ULCCs as the primary drivers of entrepreneurship and innovation in air transportation, enabling affordable fares that are typically 35-40% below those of competitors while targeting underserved travelers in high-growth markets. This approach stems from Franke's belief that "it comes down to cost," emphasizing non-traditional, no-frills operations to transform potentially unprofitable airlines into efficient, profitable entities.[60][41][1] The firm selects investments based on specific criteria, including undervalued assets with strong management potential, significant expansion opportunities in emerging markets, and the ability to implement low-cost structures. Indigo Partners seeks opportunities in regions like Southeast Asia, Latin America, Central and Eastern Europe, and North America, where low-cost market share is around 7-10% in areas like North America, allowing for scalable operations without legacy cost burdens. For instance, the philosophy favors airlines that can leverage operational efficiencies, such as outsourcing non-core functions and consolidated purchasing, to maintain the lowest cost base in their markets. Active involvement from the firm ensures these criteria are met through strategic guidance and restructuring, often installing a standardized low-cost model across portfolio companies.[38][41][60] Indigo Partners adopts a long-term holding strategy, typically spanning 5-10 years, with a focus on sustained growth rather than short-term flips, aiming for an internal rate of return exceeding 25%. This horizon allows for deep operational integration and market penetration, as evidenced by multi-billion-dollar commitments to fleet standardization and expansion in promising geographies. To manage risks, the firm diversifies across multiple regions and carrier types, mitigating exposure to localized economic volatility or regulatory changes while pursuing bulk efficiencies that enhance resilience. This disciplined, global diversification has enabled Indigo Partners to navigate industry challenges, such as fuel price fluctuations, through proactive cost controls and strategic positioning. As of 2024, the firm continued portfolio management, including distributing Frontier shares to limited partners while retaining influence.[41][61][4][2]

Operational Approach

Indigo Partners maintains a hands-on approach to managing its portfolio companies through active representation on their boards of directors, enabling direct influence over strategic and operational decisions. For instance, Managing Partner William A. Franke serves as Chairman of the Board at Frontier Airlines, a position he has held since 2013 following Indigo's acquisition of the carrier. Similarly, Managing Director Andrew Broderick holds board seats at both Frontier and Volaris, facilitating oversight of executive appointments and key leadership changes, such as the 2016 appointment of Barry Biffle as Frontier's President and CEO under Indigo's controlling influence.[15][62][63] To drive cost efficiencies, Indigo Partners emphasizes standardization of operational processes and shared procurement across its holdings, leveraging collective scale for volume purchasing of aircraft, fuel, and maintenance services. This approach, highlighted in Frontier's IPO filing, includes sharing management expertise and industry knowledge to optimize supply chain dynamics and reduce per-unit costs without compromising service quality. By negotiating bulk deals, such as the 2021 joint order for 255 Airbus A321neo aircraft among its portfolio airlines, Indigo enables cost savings estimated in the hundreds of millions through economies of scale.[64][65] Performance is monitored via key performance indicators (KPIs) that prioritize high aircraft utilization and revenue diversification, with portfolio airlines consistently targeting load factors above 85% and ancillary revenues comprising over 40% of total passenger revenue. Volaris, for example, reported ancillary revenues at 42% of operating revenue in 2021, driven by fees for baggage, seats, and onboard sales, while Frontier achieved ancillary revenue per passenger of $73.85 for the year ended December 31, 2022, exceeding fare revenue of $42.26; by 2024, Frontier's ancillary revenue had risen to 62% of total revenue. These metrics underscore Indigo's focus on ultra-low-cost carrier principles, where operational discipline supports profitability amid competitive markets.[66][67][68] Collaboration among holdings fosters knowledge sharing on best practices for route optimization and technology adoption, enhancing overall portfolio resilience. As noted in industry analyses, expertise from U.S. operations at Frontier informs expansions at carriers like Wizz Air and Volaris, including shared insights on fleet management and digital tools for reservations, though each airline maintains independent systems tailored to regional needs. This cross-pollination, rooted in Indigo's centralized oversight, has contributed to sustained growth across diverse geographies.[69][64]

Fleet Overview

Aircraft Composition

Indigo Partners' portfolio airlines collectively operate over 600 Airbus A320 family aircraft as of late 2025, emphasizing the fuel-efficient A320neo and A321neo variants to support low-cost operations across their networks. This standardized fleet enables economies of scale in maintenance, training, and parts procurement, aligning with the group's investment philosophy of operational efficiency.[70][71][72][73] The fleet breakdown by holding reflects tailored growth in each market: Frontier Airlines maintains 171 aircraft as of November 2025, consisting primarily of A320neo and A321neo models with a small number of legacy A320-200s. Volaris operates 152 aircraft as of September 2025, focused on A320neo and A321neo for high-frequency regional and domestic routes; the airline has faced challenges from Pratt & Whitney engine inspections, grounding an average of 36 aircraft monthly in Q3 2025, with resolution expected by end-2027.[74] JetSMART runs 53 aircraft as of November 2025, all A320 family narrowbodies suited to South American short-haul markets. Wizz Air has the largest share at 249 aircraft as of November 2025, predominantly A321neo for its extensive European and Middle Eastern network.[75][76][72][73] Aircraft configurations prioritize high-density seating to maximize revenue per flight, typically accommodating 180 to 240 passengers depending on the variant, with slimline seats and minimal amenities to reduce weight and enhance fuel efficiency. The A320neo and A321neo models, which form the majority across the portfolio, incorporate advanced engines and aerodynamics for up to 20% better fuel burn compared to previous generations.[77][71][78] Ownership is predominantly through operating leases, supplemented by direct purchases in some cases, allowing flexibility in fleet management and growth; the overall average age remains under 6 years, underscoring a commitment to modern, low-maintenance assets. For instance, Frontier's entire fleet is leased, while Wizz Air mixes leases with owned aircraft to support rapid expansion.[75][79][80]

Future Orders

Indigo Partners' portfolio airlines have collectively ordered approximately 500 A320neo family aircraft since the 2010s, primarily through joint commitments that leverage economies of scale in procurement and financing. Key orders include a 430-aircraft agreement finalized in 2017 for A320neo and A321neo variants across Frontier Airlines, Volaris, JetSmart, and Wizz Air, valued at $49.5 billion at list prices, and a subsequent 255 A321neo family order in 2021, including options for A321XLR long-range models.[81][65] These acquisitions focus on fuel-efficient narrowbody jets to support low-cost carrier operations in the Americas and Europe. As of late 2025, roughly 300 aircraft from these orders remain pending delivery, though total backlogs across the portfolio exceed this when accounting for all commitments. Breakdowns include over 100 for Frontier Airlines (with 178 firm orders through 2031, 85% A321neo), more than 80 for Volaris (122 in backlog amid Pratt & Whitney engine inspections), around 50 for JetSmart (planning over 50 additions in the next six years), and over 200 for Wizz Air (273 outstanding, primarily A321neo).[75][82][83][84] Deliveries are scheduled to peak between 2025 and 2028, driven by Airbus production ramp-ups but constrained by supply chain backlogs and engine certification delays for models like the A321XLR. Wizz Air recently deferred 88 deliveries to 2033 and reduced its A321XLR commitment from 47 to 11-15 units to align with near-term European network priorities, while maintaining its overall backlog.[85] These timelines reflect broader industry challenges, including Airbus' global order backlog of over 8,600 aircraft as of September 2025.[86] The future orders enable substantial capacity expansion, positioning the portfolio to serve over 150 million passengers annually by the late 2020s through fleet modernization and route densification. This growth supports Indigo Partners' low-cost model while advancing sustainability objectives, such as integration of sustainable aviation fuel (SAF); in 2023, the firm and its airlines invested $50 million in CleanJoule, a SAF producer, committing to purchase up to 90 million gallons to decarbonize operations.[87] The A320neo family's 20% fuel efficiency gains further reduce emissions per passenger, aligning with portfolio-wide goals for net-zero aviation contributions.

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