????????
      ----------
XCPMW ) MXPYLMXR
       -XCPMW
        =====
        UQPWYM
       -UQCPUT
        ======
          CWPYXR
         -WPPMMT
          ======
          ??????

base: 12
symbols: CLMNPQRTUWXY
difficulty: hard
hints: R << U
missing: N