[(5, 2), (2, 5), (5, 8), (7, 8), (7, 2), (5, 2)]
(4, 3)
(3, 4)
(2, 5)
(3, 6)
(4, 7)
(5, 8)
(6, 8)
(7, 8)
(7, 7)
(7, 6)
(7, 5)
(7, 4)
(7, 3)
(7, 2)
(6, 2)
(5, 2)
[(7, 7), (7, 6), (7, 5), (7, 4), (7, 3), (7, 2)]
[(6, 8), (7, 8), (6, 2), (5, 2)]
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....*....
.../.\...
../...\..
.*.....*.
.|.....|.
.*=====*.
.........