.............oooooooo..................
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...........obbaaacbbbbo................
..........obbbaaacbbbbbo.ooo...........
.........obbbaaacaabbbbbobbboo.........
........obbbaaaacaaabbbcobbcbbo........
........obbaaaaaacaabbbcoaacbbbo.......
......ooobbaaaaaaabbbbbboacbbbbbooo....
....oobbbooaaaaaaabbbbbbcocabbbcobbo...
...obbbabbboaaaaabbbbbbccoacbbbboacbo..
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.obbbbbcccccobbbccccccccocccccccoccco..
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...occccccocccccccccccocccccccooooo....
....oooooooccccccccccooooooooo.........
...........oooooooooo..................