MYFN
      +---------
WMUJQ | HFPPJXQQ
       -WMUJQ
        =====
        MQGGPX
       -MPHGTY
        ======
         MXTPFQ
        -MXMRMH
         ======
           UYGXQ
          -YFXQN
           =====
           WMHUW

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: medium
missing: L