How frequently did the words 1 and 25 appear together?
How frequently refers to occurrences;  word 1 refers to wid = 1; word 25 refers to wid = 25; appear together means pair, which is a relationship of two words: w1st and w2nd, where w1st is word id of the first word and w2nd is a word id of the second word;  w1st or w2nd = wid = 1; w1st or w2nd = wid = 25;
SELECT occurrences FROM biwords WHERE w1st = 1 AND w2nd = 25
database name:db_id language_corpus
langs table langs Cols: language id dtype integer, language dtype text, locale dtype text, pages dtype integer, words dtype integer, 
pages table pages Cols: page id dtype integer, language id dtype integer, page dtype integer, revision dtype integer, title dtype text, words dtype integer, 
words table words Cols: word id dtype integer, word dtype text, occurrences dtype integer, 
langs_words table langs_words Cols: language id dtype integer, word id dtype integer, occurrences dtype integer, 
pages_words table pages_words Cols: page id dtype integer, word id dtype integer, occurrences dtype integer, 
biwords table biwords Cols: language id dtype integer, word id of the first word dtype integer, word id of the second word dtype integer, occurrences dtype integer, 
