Problem      3001        3003

#     1                            H                   G
#     2                            F                    E
#     3                            F                    E
#     4                            H                   G
#     5                            D                    C
#     6                            F                     E
#     7                            D                    E
#     8                            A                    B
#     9                            A                    B
#    10                           I                      J
#    11                           H                    G
#    12                           B                     A
#    13                           B                     A
#    14                           E                     F
#    15                            J                     I
#    16                           A                    B
#    17                           F                     E
#    18                           A                    B
#    19                           C                     D
#    20                           J                      I
#    21                           B                     D
#    22                           A                     C
#    23                           H                     H