sindarin_grammar1-6  Exercise 3: Prepositions
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  an   to/towards      nasal change
  na   to, at, with    soft change
  vi   in              no change

  nan  = na + in   "to the"
  uin  = o + in    "from the"   (o "from" merged with the article)

The lists are from the elvish.org summary; trigger lists differ between
sources, so treat them as a guide.