?????????
      +----------
WQMYW | QMMYTRJJJ
       -QTJTG
        =====
         EHJFR
        -QTJTG
         =====
         TJHGJJ
        -TEYWMR
         ======
           MTMQJ
          -EEEWF
           =====
           YNTRTJ
          -YNHPGT
           ======
           ??????

base: 13
letters: EFGHJMNPQRTWY
difficulty: intermediate