How many times did the word "grec" occur on the page titled "Àbac"?
how many times occur refers to occurrences; page titled "Àbac" refers to title = 'Àbac' ;
SELECT T2.occurrences 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 T3.title = 'Àbac' AND T1.word = 'grec'