????????
      +---------
XXMPT | XWXYTYJU
       -MTXMRU
        ======
         WTTLLJ
        -WYYJLM
         ======
          JJWTLU
         -WYYJLM
          ======
          ??????

base: 11
letters: FJLMPRTUWXY
missing: F
hints: P != 0, U == 1 
difficulty: hard