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xxxxxxxxxxxxxxxxxxxx
x...x...x....x...x+x
x...o..o.....x.o.x.x
xxox.oxxx.x....oox.x
x..x..x=xxx..xo.o..x
x..xox====x..x.xxx.x
x.o..x=====xx....x.x
xxo..x=x====xoo.o..x
x..xxxxxx==xx.x..x.x
x..o.........o.xxx.x
x...x...x........x.x
xxxxxxxxxxxxxxxxxxxx
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