ZLP
      +--------
ZPZZM | YZPLHMU
       -JTVQU
        =====
        ZWYZZM
       -TNPYUR
        ======
         GPXNUU
        -GUXZPR
         ======
          TWQYM

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: hard
attributes: detailed