JEPE
      +---------
PPJYP | JLPMGFUJ
       -JEERJ
        =====
         EXEMF
        -EGRGE
         =====
          PTXLU
         -PPJYP
          =====
           GJMLJ
          -EGRGE
           =====
            REJU

base: 13
letters: EFGHJLMPRTUXY
difficulty: medium
missing: H