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]● ==> J10  [ 4]○ ==> I9   [ 5]● ==> I8
[ 6]○ ==> G9   [ 7]● ==> J9   [ 8]○ ==> J8   [ 9]● ==> K10  [10]○ ==> L11
[11]● ==> K7   [12]○ ==> J11  [13]● ==> G8   [14]○ ==> I11  [15]● ==> K11
[16]○ ==> H10  [17]● ==> F8   [18]○ ==> E8   [19]● ==> H7   [20]○ ==> G6
[21]● ==> F9   [22]○ ==> I6   [23]● ==> L10  [24]○ ==> M10