????????
      +---------
UGLHY | XMRXPRMH
       -UGLHY
        =====
        JWXRNR
       -JYWUME
        ======
          GPEEM
         -MNWPM
          =====
           EWGHH
          -MNWPM
           =====
           ?????

base: 13
letters: EGHJLMNPRUWXY
difficulty: intermediate