env3;
f;
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x . 0 . x x x x x x x . 1 . x
x # . # x # . # . # x # . # x
x x x x x . 4 x 7 . x x x x x
x # x # x # . # . # x # x # x
x x . . x x x x x x x . . x x
x # 8 # x # x # x # x # 9 # x
x x . . x x x x x x x . . x x
x # x # x # . # . # x # x # x
x x x x x . 6 x 5 . x x x x x
x # . # x # . # . # x # . # x
x . 3 . x x x x x x x . 2 . x