????????
     +---------
FFPP | RCQRWCCF
      -RPRFF
       =====
        FWWCC
       -WCFCQ
        =====
         WCHRC
        -WPHFW
         =====
          WCFWF
         -WPHFW
          =====
          ?????

base: 7
letters: CFHPQRW
difficulty: intermediate