20 20
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x            x o   x
x x        G x   x x
x   xxxxx  xxxxx   x
x                  x
x x      xx      x x
x x x x  xx  x x x x
x x      xx        x
x x x x  xx  x x x x
x x              x x
x x     o          x
x x xxxxxx   x   x x
x x xu   x   x     x
x x xxxx x    x  x x
x x   ox x O     x x
x                x x
x          x x x   x
x x              x x
x                  x
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