????????
      +---------
RTEJT | JTFYJEFU
       -RTEJT
        =====
         HRCHE
        -RTEJT
         =====
         WTRWYF
        -WJEWQC
         ======
           JHHYU
          -RTEJT
           =====
          ??????

base: 11
letters: CEFHJQRTUWY
difficulty: medium