check empty
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@ -128,12 +128,12 @@
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~ return true
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=== function can_move_to_col(ref column_one, ref column_two)
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~ temp x = lastcard(column_one)
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~ temp y = lastcard(column_two)
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{ x == ():
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~ return false
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}
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{ y == ():
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~ return true
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}
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~ temp x = lastcard(column_one)
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~ temp y = lastcard(column_two)
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~ return (( (!is_black(x) && is_black(y)) || (is_black(x) && !is_black(y)) ) && follows(x,y) )
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