RLP
      +---------
LQGXN | RHENRUYG
       -EHPQUH
        ======
         LRXYEY
        -PQLUGP
         ======
          HJUHRG
         -HXEQPJ
          ======
            HNGH

base: 13
letters: EGHJLNPQRTUXY
difficulty: medium
restrictions: no multiplication
missing: T