????????
      +---------
JJPPH | NLTNHJLX
       -JJPPH
        =====
        UMHMRJ
       -UXLHLM
        ======
          HWRGL
         -XHQTU
          =====
          JRMUWX
         -JRTRJN
          ======
          ??????

base: 13
letters: GHJLMNPQRTUWX
difficulty: medium