Problem      1001        1003

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