15 ABC DEF up GHI JKL even EF DA up AFG JKL down A J down A D even ED FG even AB CI up A D up IL JK even A B even E L down BEF JIL down J A even CEF BJI even AC BD down AC EF down A F even IJK ABC even C L even L F up IJK ABC even C L even L F down ABCDE FGHIJ even EIL ADJ down K J even CBA DEF up AF BC up BA CD up CBA DEF up A B up BA CD up CBA DEF up B A down BA CD up CBA DEF down AF BC down BA CD down CBA DEF down A B down BA CD down CBA DEF down B A up BA CD down