RPJ
      +--------
RXLLF | TRRYYLT
       -GGQPW
        =====
         XPJFL
        -YQGTT
         =====
         QUWQWT
        - HRMXY
         ======
          QLGQJ

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: medium
missing: N