HQPR
      +---------
MPXMQ | RHLHJFPM
       -TTLTG
        =====
        MGQGHF
       -MRHQGM
        ======
         MLGLHP
        -MTTGLX
         ======
          MXGGRM
         -MMPFXF
          ======
            QFFG

base: 11
letters: FGHJLMPQRTX
difficulty: intermediate
restrictions: no multiplication