????????
      +---------
WMUCL | CQGRQCQL
       -WMUCL
        =====
        YYQGLC
       -YYUNUU
        ======
          CGCMQ
         -WMUCL
          =====
           MMXLL
          -MYRLR
           =====
           ?????

base: 12
letters: CGLMNQRTUWXY
difficulty: medium
missing: T