kirjoihinsa
Kirjoihinsa is a Finnish grammatical form that conveys movement toward or into writings belonging to someone, and is commonly glossed in English as into their writings. It is a product of standard Finnish morphology, combining a directional case with the third-person plural possessive suffix.
The form is built from the noun meaning writing or writings, together with case and possessive markers.
Kirjoihinsa is used in contexts where something is directed toward, or located within, writings that belong
Finnish distinguishes illative forms like kirjainko/kirjoihin with possessive suffixes to express similar ideas. The illative form
See also: Finnish grammar, illative case, possessive suffixes in Finnish, kirja/kirjoitus as root nouns.