GJM
      +--------
WJRWQ | RNQMRXR
       -RYUXJ
        =====
         MFHMX
        -JTGYN
         =====
          YWPLR
         -MQQRR
          =====
           JFTF

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard