????????
      +---------
RLQLQ | FQFFMQTN
       -LXMXF
        =====
        HRGFRQ
       -HHPTPQ
        ======
         HPRFXT
        -HCHGHT
         ======
          HXGMXN
         - GFRFX
          ======
          ??????

base: 12
letters: CFGHLMNPQRTX
difficulty: medium