Universal 767:

Original: If a language has only one primary fricative its primary allophone is most likely to be /s/.
Standardized: IF there is only one primary fricative, THEN its primary allophone is most likely to be /s/.
Keywords: fricative, sibilant
Domain: phonology
Type: no genuine implication; rather: provided that
Status: achronic
Quality: statistical
Basis: 317 language sample from Nartey 1979
Source: Nartey 1979: 4, cited also in Lass 1984: 154

FP