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B B BBp BBB BBBBB B
B B B B     B   B B
B B B BBBBB B BBB B
B B B     B B B   B
B BBBBB BBB B B B B
B       B   B   B B
B aBBBBBB BBB BBB B
B B       B   B   B
B BBB BBB B BBB B B
B     B B B     B B
B BBBBB BBB BBB B B
B B         B B B B
B BBB BBBBBBB B B B
B   B B B     B B B
B BBB B BBB BBB B B
B                 B
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