240_Stopwords/10_Intro.asciidoc 240_Stopwords/20_Using_stopwords.asciidoc 240_Stopwords/30_Stopwords_and_performance.asciidoc 240_Stopwords/40_Divide_and_conquer.asciidoc 240_Stopwords/50_Phrase_queries.asciidoc 240_Stopwords/60_Common_grams.asciidoc 240_Stopwords/70_Relevance.asciidoc