ONI 2024 IX (#1076) 3 problems

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ONI 2023 IX (#195) 3 problems

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ONI 2022 IX (#562) 3 problems

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ONI 2021 IX (#568) 3 problems

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ONI 2019 IX (#574) 6 problems

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ONI 2018 IX (#580) 6 problems

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ONI 2017 IX (#586) 6 problems

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ONI 2016 IX (#592) 6 problems

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ONI 2015 IX (#598) 6 problems

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ONI 2014 IX (#604) 6 problems

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ONI 2013 IX (#610) 6 problems

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ONI 2012 IX (#616) 6 problems

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ONI 2011 IX (#622) 6 problems

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ONI 2010 IX (#628) 6 problems

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ONI 2009 IX (#634) 6 problems

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ONI 2008 IX (#640) 6 problems

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ONI 2007 IX (#646) 6 problems

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ONI 2006 IX (#652) 6 problems

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ONI 2005 IX (#658) 6 problems

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ONI 2004 IX (#664) 6 problems

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ONI 2003 IX (#670) 6 problems

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ONI 2002 IX (#676) 6 problems

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ONI 2001 IX (#680) 6 problems

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ONI 2000 IX (#682) 6 problems

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ONI 1998 IX (#1156) 1 problem

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