python C3
object/ \
B A
| / \
| C D
\/ |
E |
\ /
F
L(A) = AO
L(B) = BO
L(C) = CAO
L(D) = DAO
L(E) = E + merge(BO,CAO,BC)
= E + B + merge(O,CAO,C)
= EBCAO
L(F) = F + merge(EBCAO,DAO,ED)
= F + E + merge(BCAO,DAO,D)
= F + E + B + merge(CAO,DAO,D)
= F + E + B + C + merge(AO,DAO,D)
= FEBCDAO
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