WJJL
      +---------
NGGEJ | PEJELLJL
       -NGGEJ
        =====
        ENYUWL
       -EWQUHT
        ======
         ENMYGJ
        -EWQUHT
         ======
          EJYPTL
         -EQNGJH
          ======
           EQLNH

base: 13
letters: EGHJLMNPQTUWY
difficulty: medium