????????
      +---------
MPXRP | JPJPGMXL
       -MPXRP
        =====
        QHCMMM
       - MPXRP
        ======
         XGWWJX
        -RLJRHM
         ======
          MMRMML
         -MRXPMQ
          ======
          ??????

base: 11
letters: CGHJLMPQRWX
difficulty: medium