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xxxxxxxxxxxxxxxxxxxx
x.x.....x..........x
x.......o..xx.xxx.xx
xxxxx..xx...o..o...x
xx==xx..x.x.o.x.x..x
x====..o.....xxox.xx
x====..oxxxxx...xoxx
xx==x.x..x...x..o..x
xxx=x.x..o...o..x.+x
xx..o..o.x...x..xxxx
xx.......xxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxx
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