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b   b   b   b   b b     b     b   b b b
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b   b   b     b b b     b     b   b b b
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b   b   b   b   bsb       b   b     b b
b bbbbb bbb b b bbb bbbbb b bbbbbbbbb b 
b b   b   b b b b b b     b b         b
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b b b b   b b b   b b b   b b b b     b
b b b b bbb b b bbb b bbbbb bbb b bbbbb
b b b   b   b b b   b       b   b b   b
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b b   b   b b b   b b         b   b   b
b bbb b bbbbb b bbb b bbb bbbbb bbbbb b
b   b b b   b b b   b b   b   b b     b
b b b b b b b b b bbb b bbbbb b b bbb b
b b b b b b   b b b   b b     b b b b b
b b b b b bbb b b b bbb b b bbb b b b b
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b b     b     b b   b b       b   b b b
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b     b     b b b   b     b b   b b b b
bbbbb b b bbb b bbbbb bbb b bbbbb b b b
b     b b b   b     b   b b     b b b b
b bbbbb b b bbbbbbb bbbbb bbbbb b b b b
b       b b       b       b   b b b   b
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b b       b   b     b     b b   b b b b
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b b   b     b b     b b   b       b   b
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