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]● ==> H6   [ 4]○ ==> I10  [ 5]● ==> I6
[ 6]○ ==> I9   [ 7]● ==> G9   [ 8]○ ==> G8   [ 9]● ==> J11  [10]○ ==> I7
[11]● ==> I8   [12]○ ==> G6   [13]● ==> K10  [14]○ ==> J7   [15]● ==> I12
[16]○ ==> L9   [17]● ==> J9   [18]○ ==> L11  [19]● ==> J12  [20]○ ==> J10
[21]● ==> I11  [22]○ ==> H10  [23]● ==> G11  [24]○ ==> G10  [25]● ==> F10
[26]○ ==> H11  [27]● ==> H13  [28]○ ==> G14  [29]● ==> I13  [30]○ ==> H12
[31]● ==> J13  [32]○ ==> K13  [33]● ==> F11