WMR
      +--------
NQNXJ | LXLQXLF
       -JRLJN
        =====
        HMYFPL
       -HGUWRG
        ======
         MHTYLF
        -WXNHLN
         ======
          QHUGQ

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard