????????
      +---------
TTQYF | UNRLQNQU
       -TTQYF
        =====
        WGXYRN
       -WLLTJW
        ======
         LYTLRQ
        -LWWTFG
         ======
          ERGMUU
         -EYYFLT
          ======
          ??????

base: 14
letters: EFGJLMNQRTUWXY
difficulty: challenging
hints: Y << X