sindarin_grammar1-2  Exercise 2: Stress
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  pe-do          two syllables              PE-do
  min-no         two syllables              MIN-no
  El-be-reth     penult "be" open, short (light)       EL-be-reth
  Mith-ran-dir   penult "ran" closed (heavy)           mith-RAN-dir

Rule: two syllables -> first; longer -> penult if heavy (long vowel,
diphthong or closed syllable), else the antepenult.