فَإِنَّ مَعَ الْعُسْرِ يُسْرًا
For indeed, with hardship there is ease.
Al-ʿusr is definite while yusran is indefinite, and the pair recurs in the next verse. The contrast supports rhetorical reflection, but the grammatical form alone should not be pressed into a mathematically certain count of separate eases.
A careful reading keeps definiteness, repetition and reassurance in view. If a particular exegetical inference is taught, identify it as an interpretation rather than an unavoidable numerical consequence of syntax.