Problem       2011        2014

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