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anteeksi! en voi sanoa täydellinen lause suomeksi...
Base form = öisin
Öisin = in night time
Öisinkin = I'm working in night time too / olen töissä öisinkin
yö night is the base
you know that the plural is build with i
and is there are already 2vocals the first one disappears (yöllä -> öillä)
-isin is a rare transformation, that means regually (eg maanantaisin on mondays), it is an adverb then