sekoitettujen
Sekoitettujen is a Finnish grammatical form, not a standalone lexical item. It is the genitive plural of the past passive participle sekoitettu, which comes from the verb sekoittaa meaning to mix. As a participial adjective, sekoitettujen is used to describe nouns that are in plural and in genitive case.
In practice sekoitettujen functions as a modifier that indicates that the described items have been mixed.
Grammar notes: sekoitetun, sekoitetut, sekoitettujen are inflected forms of the same participle. Seikoitettujen is specifically the
See also: sekoittaa, sekoittaminen, past participles in Finnish grammar.