....................
....................
....................
....................
xxxxxxxxxxxxxxxxxxxx
x...x....x...x...x+x
x.o......o...o...x.x
xx.xxx==xx.xxx.....x
x...x====xox..oxxx.x
x.o.x====x..o..o.o.x
x...x====x.x.x.o.o.x
x...xx==xx...xox...x
xxoxx....xx..x..xoxx
x...o..o.....x..x..x
x...x....x...x.....x
xxxxxxxxxxxxxxxxxxxx
....................
....................
....................
....................
