goal reached
X X X X X X X X X X   0
X X X O . . . 1 . X
X X X . . . . X X X
X A X . . . . X B X
X > . . O @ . . < X
X B X . . . . X A X
X X X . . . . X X X
X . 1 . . . @ X X X
X X X X X X X X X X
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X X X X X X X X X X   2
X X X O . . A . . X
X X X . . . . X X X
X . X . . . . X B X
X > . . O @ . . < X
X B X . . . . X A X
X X X . . . . X X X
X . 1 . . . @ X X X
X X X X X X X X X X
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X X X X X X X X X X   4
X X X O . B A . . X
X X X . . . . X X X
X . X . . . . X B X
X > . . O @ . . < X
X . X . . . . X A X
X X X . . . . X X X
X . 1 . . . @ X X X
X X X X X X X X X X
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X X X X X X X X X X   5
X X X O . . A . . X
X X X . . . . X X X
X . X . . . . X B X
X > . . O @ . . < X
X . X . . . . X A X
X X X . . . . X X X
X . 1 . . . B X X X
X X X X X X X X X X
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X X X X X X X X X X   7
X X X B . . A . . X
X X X . . . . X X X
X . X . . . . X . X
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X . X . . . . X A X
X X X . . . . X X X
X . 1 . . . B X X X
X X X X X X X X X X
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X X X X X X X X X X   8
X X X B . . A . . X
X X X . . . B X X X
X . X . . . . X . X
X > . . O @ . . < X
X . X . . . . X A X
X X X . . . . X X X
X . 1 . . . @ X X X
X X X X X X X X X X
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X X X X X X X X X X   10
X X X B . . A . . X
X X X . . . B X X X
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X . X . . . . X . X
X X X . . . . X X X
X . . A . . @ X X X
X X X X X X X X X X
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X X X X X X X X X X   11
X X X B A . . . . X
X X X . . . B X X X
X . X . . . . X . X
X > . . O @ . . < X
X . X . . . . X . X
X X X . . . . X X X
X . . A . . @ X X X
X X X X X X X X X X
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X X X X X X X X X X   12
X X X O A . . . . X
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X . X . . . . X . X
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X . X . . . . X . X
X X X B . . . X X X
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X X X X X X X X X X
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X X X X X X X X X X   13
X X X O A . . . . X
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X X X X X X X X X X
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X X X X X X X X X X   14
X X X O A . . . . X
X X X . B . B X X X
X . X . A . . X . X
X > . . O @ . . < X
X . X . . . . X . X
X X X . . . . X X X
X . . . . . @ X X X
X X X X X X X X X X
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X X X X X X X X X X   15
X X X O A . . . . X
X X X . B B . X X X
X . X . A . . X . X
X > . . O @ . . < X
X . X . . . . X . X
X X X . . . . X X X
X . . . . . @ X X X
X X X X X X X X X X
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X X X X X X X X X X   16
X X X O A . . . . X
X X X B . B . X X X
X . X . A . . X . X
X > . . O @ . . < X
X . X . . . . X . X
X X X . . . . X X X
X . . . . . @ X X X
X X X X X X X X X X