UNWC
      ----------
 CWCC ) UNXYEANE
       -ACQCN
        =====
         NWYUA
        -QCACU
         =====
          WWUCN
         -NCYCA
          =====
           CAEXE
          -WCECY
           =====
            ACXC

base: 10
symbols: ACEHNQUWXY
difficulty: intermediate
missing: H