A B C D E F G H I J K L M N O
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  1 └┴┴┴┴┴┴┴┴┴┴┴┴┴┘ 

[ 1]● ==> H8	[ 2]○ ==> I9	[ 3]● ==> J8	[ 4]○ ==> I7	[ 5]● ==> I8
[ 6]○ ==> G8	[ 7]● ==> K8	[ 8]○ ==> L8	[ 9]● ==> J7	[10]○ ==> J9
[11]● ==> K6	[12]○ ==> H9	[13]● ==> K9	[14]○ ==> K5	[15]● ==> I6
[16]○ ==> H5	[17]● ==> J6	[18]○ ==> L5	[19]● ==> J5	[20]○ ==> J4
[21]● ==> M8	[22]○ ==> L7	[23]● ==> L9	[24]○ ==> M10	[25]● ==> K10