Universal 1099:

Original: If a language has nasal vowels, it will have at least three, one of which is always a low vowel [ã].
Standardized: IF there are nasal vowels, THEN there are at least three, one of which is always a low vowel [ã].
Keywords: nasal, vowel
Domain: phonology
Type: implication
Status: achronic
Quality: absolute
Basis: sample of 55 languages in Ferguson 1974, languages in Ferguson 1975
Source: Ferguson 1974: 7, Ferguson 1975: 178

FP