??????
     --------
WWQQ ) LWTPEF
      -TTWW
       ====
        EWTE
       -PPMM
        ====
        QPQLF
       -QLTXX
        =====
        ?????

base: 10
symbols: EFJLMPQTWX
difficulty: medium
hints: P << X, X << F
missing: J