WYE
     +--------
YTXW | XTHWGWM
      -XTTUT
       =====
         EUGW
        -ETCT
         ====
          UHWM
         -GTWT
          ====
          XHTM

base: 12
letters: CEGHMPRTUWXY
difficulty: hard
hints: R << P, M << U
missing: P R