An இடைச்சொல் type: சாரியை are small euphonic pieces inserted purely to smooth the join between a word and its suffix, without adding meaning of their own.

சாரியை never changes a word's meaning even slightly - remove it and the join just sounds awkward, which is the surest sign it was purely for smoothness.

அன், அம், அத்து, அற்று, இன்.