????????
      +---------
CUUMH | HBRRTBYT
       -HFUHMY
        ======
         HRYMCY
        -HQUHUQ
         ======
          MYHCHT
         -MTUHYF
          ======
          ??????

base: 10
letters: BCFHMQRTUY
difficulty: hard
hints: H << M, R << F