tolkienlanguages1-3  Exercise 1: Marking the Stress
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Rule: two syllables -> first. Longer -> penult if heavy, else antepenult.
Heavy = long vowel, diphthong or closed syllable.

  Le-go-las      penult "go" is open and short (light)      -> LE-go-las
  A-ra-gorn      penult "ra" is open and short (light)      -> A-ra-gorn
                 (the stress falls on the first syllable, A)
  Sil-ma-ril     penult "ma" is open and short (light)      -> SIL-ma-ril

In all three the penult is light, so the stress moves back to the antepenult.