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xxxxxxxxxxxxxxxxxxxx
x................xxx
x.ox...o.xx..o....xx
x....oxxx....x.oo.xx
x=xxx.....o.o.xx..xx
x===x..x..x....xo..x
x==xxooxxxx.o..x...x
x===x......o.xx..xxx
x===o..xxx..x....x.x
xx==..ox..xx...xx+.x
xxx=x..............x
xxxxxxxxxxxxxxxxxxxx
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