... of salient words ag-gregated using synonymy, similarity, or subtreesof a thesaurus. However, salient word selection and aggregation is non-obvious and furthermoreit falls into word sense disambiguation, ... frequent words F to generalizewords to word classes”. We define a word classas either a word itself or its part of speech. Givena sentence s = w1, w2, . . . , w|s|, where wiis thei-th word ... skof sk and sjof sjas fol-lows:Sa,b=1 if ωka= ωjb0 otherwisewhere ωka and ωjbare the a-th and b-th word classesof sk and sj, respectively. In other words, thematching...