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

[ 1]● ==> H8	[ 2]○ ==> H9	[ 3]● ==> H10	[ 4]○ ==> F8	[ 5]● ==> I9
[ 6]○ ==> J10	[ 7]● ==> J8	[ 8]○ ==> K7	[ 9]● ==> I8	[10]○ ==> K8
[11]● ==> I7	[12]○ ==> I6	[13]● ==> K9	[14]○ ==> L10	[15]● ==> G7
[16]○ ==> G6	[17]● ==> F10	[18]○ ==> G9	[19]● ==> G11	[20]○ ==> F12
[21]● ==> D8	[22]○ ==> E9	[23]● ==> F6	[24]○ ==> E5	[25]● ==> G5