?????????
     +----------
UEER | MEMRRMWRR
      -WUMRM
       =====
        EUUEM
       -EEUWU
        =====
         RYWHW
        - UEER
         =====
           MURRR
          -WUMRM
           =====
           ?????

base: 7
letters: EHMRUWY
difficulty: easy