HHJ
     +-------
HWMJ | WGMJFM
      -WPHF
       ====
        MLMF
       -WPHF
        ====
        PHJQM
       -PQHWM
        =====
         HPWQ

base: 10
letters: FGHJLMPQTW
difficulty: intermediate
missing: T