PPPP
      +---------
QPRPP | QEHGFEHH
       -QPRPP
        =====
         QEEPE
        -QPRPP
         =====
          QGYHH
         -QPRPP
          =====
           HPQQH
          -QPRPP
           =====
            RHJQ

base: 11
letters: CEFGHJPQRUY
missing: U C
hints: G < U, J << C
difficulty: intermediate
restrictions: no multiplication for one