????????
      ----------
LTWWW ) WWHTMMLW
       -WEWWT
        =====
         MHTWM
        -LTWWW
         =====
          ETWTL
         -YMWWU
          =====
          LHWTYW
         - WEWWT
          ======
          ??????

base: 9
symbols: EHLMPTUWY
missing: P
difficulty: medium