Sentence:  With A-Q-10 opposite x-x-x, you have a 24% chance of three tricks, both missing honors being <WSD>onside</WSD>.  You have a 52% chance of two tricks, with one honor <WSD>onside</WSD> and the other offside. FInally, you have a 24% chance of making only one trick, when both the king and the jack are offside. 
Meaning of the word marked with <WSD> tags:  Favourably located, from the point of view of the player taking a finesse.