PPTQ
      +---------
PPRHY | YQRRYHPY
       -QYHTQ
        =====
         YRPTH
        -QYHTQ
         =====
          QTYPP
         -PPRHY
          =====
          TYPTRY
         -TRQHRP
          ======
           TQTHR

base: 6
letters: HPQRTY
difficulty: easy