QRFX
      +---------
XXGPX | HRLTLQHG
       -XXGPX
        =====
         YPQNQ
        -UGFGU
         =====
         RQLFFH
        -RJRLRP
         ======
          QXTNLG
         -QXFJFN
          ======
            FNQF

base: 13
letters: FGHJLNPQRTUXY
difficulty: medium