Try doing this puzzle. It should take 15 moves) Six counters - three black and three white - are place on a grid of seven squares White counters move left to right, either by esliding into a vacant space or jumping over one black counter into a vacant space. Black counters move right to left, either by sliding into a vacant space or jumping over one white counter into a vacant space. Explain the sequence of moves to reverse the positions of the two sets of counters.

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