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74 proofs
isf_001 isf_002 isf_003 isf_004 isf_005
isf_006 isf_007 isf_008 isf_009 isf_010
isf_011 isf_012 isf_013 isf_014 isf_015
isf_016 isf_017 isf_018 isf_019 isf_020
isf_021 isf_022 isf_023 isf_024 isf_025
isf_026 isf_027 isf_028 isf_029 isf_030
isf_031 isf_032 isf_033 isf_034 isf_035
isf_036 isf_037 isf_038 isf_039 isf_040
isf_041 isf_042 isf_043 isf_044 isf_045
isf_046 isf_047 isf_048 isf_049 isf_050
isf_051 isf_052 isf_053 isf_054 isf_055
isf_056 isf_057 isf_058 isf_059 isf_060
isf_061 isf_062 isf_063 isf_064 isf_065
isf_066 isf_067 isf_068 isf_069 isf_070
isf_071 isf_072 isf_073 isf_074