????????
      +---------
YXPCR | PCFHMELL
       -PMWEE
        =====
         RPPCE
        -PMWEE
         =====
          EELHL
         -WYPUR
          =====
          YMCMCL
         -YUXLWR
          ======
          ??????

base: 12
letters: CEFHLMPRUWXY
difficulty: hard