????????
      +---------
FWJRJ | LJNFMGGP
       -JFRLE
        =====
        WFWUJG
       -WWRHYF
        ======
          LPJJG
         -JFRLE
          =====
          WYHNNP
         - MEFPN
          ======
          ??????

base: 13
letters: EFGHJLMNPRUWY
difficulty: easy