CYXY
      ----------
THHWP ) NHWPXYWN
       -YHHNC
        =====
        CHTTRY
       -PNHCWY
        ======
         CTPPHW
        -CPHCNX
         ======
          CHNPXN
         -PNHCWY
          ======
           CXMTC

base: 10
symbols: CHMNPRTWXY
difficulty: intermediate
restrictions: no multiplication