Universal 1842:

Original: If a language has a long raised low front unrounded vowel [æ:] then it also has a long high front unrounded vowel [i:].
Standardized: IF there is a long raised low front unrounded vowel, THEN there is also a long high front unrounded vowel.
Keywords: vowel, unrounded, low, high, front
Domain: phonology
Type: implication
Status: achronic
Quality: absolute
Basis: Maddieson’s UPSID-451 database
Source: Pericliev (i.p.)

FP