JUU
      +---------
PYJPU | JWLGMMTU
       -MUCTUU
        ======
         GPMYLT
        -GJTCMU
         ======
          UWLGYU
         -GJTCMU
          ======
           LUUGW

base: 10
letters: CGJLMPTUWY
difficulty: medium
restrictions: no multiplication