Crasis.—In crasis, the first word (as less important) loses its accent: τἀ_γαθά for τὰ ἀγαθά, τἀ_ν for τὰ ἐν, κἀ_γώ for καὶ ἐγώ.
a. If the second word is a dissyllabic paroxytone with short ultima, it is uncertain whether, in crasis, the paroxytone remains or changes to properispomenon. In this book τοὔργον, τἄ_λλα are written for τὸ ἔργον, τὰ ἄλλα; but many scholars write τοὖργον, τἆλλα.
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].