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]● ==> F7
[ 6]○ ==> I7   [ 7]● ==> G5   [ 8]○ ==> I8   [ 9]● ==> I6   [10]○ ==> J7
[11]● ==> K6   [12]○ ==> G8   [13]● ==> G7   [14]○ ==> F6   [15]● ==> J5
[16]○ ==> K7   [17]● ==> L7   [18]○ ==> I4   [19]● ==> L6   [20]○ ==> M6
[21]● ==> L9   [22]○ ==> L8   [23]● ==> M8   [24]○ ==> N9   [25]● ==> I9
[26]○ ==> J10  [27]● ==> K9   [28]○ ==> J9   [29]● ==> J8   [30]○ ==> I10
[31]● ==> H10  [32]○ ==> H11  [33]● ==> G11  [34]○ ==> F12  [35]● ==> G12
[36]○ ==> J11  [37]● ==> K12  [38]○ ==> J13  [39]● ==> J12  [40]○ ==> G10
[41]● ==> F11