HTHW
       +-----------
WMHWRT | HYTERTTYTE
        - WMHWRT
         =======
          ERHWMXY
         -EETMYWX
          =======
           HTMTYYT
          - WMHWRT
           =======
            WXYERXE
           -RHEEXHX
            =======
             WMXTME

base: 8
letters: EHMRTWXY
difficulty: easy
restrictions: no multiplication