What is the title of the page on which the word "grec" has an occurrence of 52 times.
occurrence of 52 times refers to pages_words.occurrences = 52; grec refers to word = 'grec'
SELECT T3.title FROM words AS T1 INNER JOIN pages_words AS T2 ON T1.wid = T2.wid INNER JOIN pages AS T3 ON T2.pid = T3.pid WHERE T1.word = 'grec' AND T2.occurrences = 52