List down the words with word id from 1 to 10 and write down a paired word for each of them.
word id from 1 to 10 refers to wid BETWEEN 1 AND 10
SELECT T1.word AS W1, T3.word AS W2 FROM words AS T1 LEFT JOIN biwords AS T2 ON T1.wid = T2.w1st LEFT JOIN words AS T3 ON T3.wid = T2.w2nd WHERE T1.wid <= 10 GROUP BY T1.wid