YYPP
      +----------
HRYLL | HRXPEXLYR
       -PXXLYE
        ======
         PYHPPL
        -PXXLYE
         ======
          RLHHHY
         -RHXYHE
          ======
           RLXMXR
          -RHXYHE
           ======
            RYRMY

base: 8
letters: EHLMPRXY
difficulty: intermediate
restrictions: no multiplication