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]● ==> H7   [ 4]○ ==> H6   [ 5]● ==> J6
[ 6]○ ==> G9   [ 7]● ==> G8   [ 8]○ ==> F9   [ 9]● ==> E9   [10]○ ==> F8
[11]● ==> F7   [12]○ ==> E7   [13]● ==> H10  [14]○ ==> F6   [15]● ==> E6
[16]○ ==> G10  [17]● ==> D5   [18]○ ==> C4   [19]● ==> I7   [20]○ ==> D8
[21]● ==> C9   [22]○ ==> H11  [23]● ==> I12  [24]○ ==> F11  [25]● ==> I8
[26]○ ==> I5   [27]● ==> J9   [28]○ ==> H4   [29]● ==> G5   [30]○ ==> K10
[31]● ==> J8   [32]○ ==> K8   [33]● ==> J5   [34]○ ==> J7   [35]● ==> I6
[36]○ ==> K4   [37]● ==> I9