????????
      +---------
HLWLX | XHWLNMHU
       -TEQGQ
        =====
        MTENUM
       -MEGNQP
        ======
         NQXHTH
        -NQRUMG
         ======
           XNPTU
          -TEQGQ
           =====
           ?????

base: 13
letters: EGHLMNPQRTUWX
difficulty: medium