HQW
      +--------
LRWLL | GTGRRQJ
       -LRWLL
        =====
        HHFXMQ
       - JYTJJ
        ======
         HPRMWJ
        -HLNYLT
         ======
          QRQUG

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard
hints: Q << T
missing: U