????????
      +---------
RLEQM | NLRNPXLX
       -RLEQM
        =====
        YGYPXX
       - UHPUQ
        ======
         LJMUUL
        -LRGUNP
         ======
          HMGEXX
         -HUYXGY
          ======
          ??????

base: 13
letters: EGHJLMNPQRUXY
difficulty: intermediate