JWXC
      +---------
RTLCL | GCCTLLQQ
       -RTLCL
        =====
        RQRGLL
       -TGXRCL
        ======
         PNTCLQ
        -PCXTLL
         ======
          QXQLQQ
         -QXLPLL
          ======
            JNQQ

base: 12
letters: CGJLNPQRTWXY
difficulty: medium
missing: Y