start at 5 , count backward 1 times , stop at 4, stop at 6, start at 4 , count backward 2 times , stop at 4, stop at 2, start at 8 , count backward 5 times , stop at 3, stop at 2, start at 10 , count backward 5 times , stop at 5, stop at 2, start at 9 , count backward 3 times , stop at 6, stop at 2, start at 6 , count backward 6 times , stop at 0, stop at 2, start at 7 , count backward 6 times , stop at 0, stop at 1, start at 5 , count backward 3 times , stop at 0, stop at 2, start at 3 , count backward 2 times , stop at 1, stop at 2, start at 4 , count backward 2 times , stop at 1, stop at 2.

count backward

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