LYUJ
      +---------
TUYUQ | EURRTHFE
       -QEREX
        =====
        LHFXRH
       -LUMMMT
        ======
         RFXRLF
        -RJRELR
         ======
          XRXMEE
         -XMEREY
          ======
            TFMT

base: 13
letters: EFHJLMNQRTUXY
difficulty: easy
restrictions: no multiplication
missing: N