Problem      8011        9012

#     1                            E                     F
#     2                            H                    G
#     3                            D                    C
#     4                            A                    B
#     5                            E                    F
#     6                            I                      J
#     7                            F                    E
#     8                            F                    E
#     9                            H                   G
#    10                           B                    A
#    11                           G                   F
#    12                           G                   I