Write SQL query to solve given problem: Which biwords pair has a higher occurrence, "àbac-xinès" or "àbac-grec"?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CASE WHEN ( SELECT occurrences FROM biwords WHERE w1st = ( SELECT wid FROM words WHERE word = 'àbac' ) AND w2nd = ( SELECT wid FROM words WHERE word = 'xinès' ) ) > ( SELECT occurrences FROM biwords WHERE w1st = ( SELECT wid FROM words WHERE word = 'àbac' ) AND w2nd = ( SELECT wid FROM words WHERE word = 'grec' ) ) THEN 'àbac-xinès' ELSE 'àbac-grec' END AS CALUS FROM words LIMIT 1