1 1 B B D C B A a a z y x 0 0 1 1 d c b a 0 0 1 1 D C B A x x x y y y z z z 0 0 0 0 1 0 1 0 b B B b b c C C c c d D D d d A A A t D D B B B t B B B C C C t C C C D D D

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