????????
      +---------
CMUGP | LEQTQEEE
       -CMUGP
        =====
        NXPEUE
       -NFLXTN
        ======
         XXMTXE
        - UCPXG
         ======
          MPXTUE
         -MQCNEG
          ======
          ??????

base: 12
letters: CEFGLMNPQTUX
difficulty: intermediate