goal reached
X X X X X X X X X   0
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X X . X E X . X X
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X X X X X X X X X   1
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X X . X E X . X X
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X X X X X X X X X   2
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X X . X E X . X X
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X X X X X X X X X   3
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X X X X X X X X X   4
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X X X X X X X X X   5
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X X X X X X X X X   6
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X X X X X X X X X   7
X X X X . X X X X
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X X X X X X X X X   8
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X X X X X X X X X   9
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X X X X X X X X X   10
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X X X X X X X X X   11
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X X X X X X X X X   12
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X X X X X X X X X   14
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X X X X X X X X X   16
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X X X X X X X X X   17
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X X X X X X X X X   18
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X X X X X X X X X   19
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X X X X X X X X X