Example
The English plural morpheme for nouns has three allomorphs:
(notation in SAMPA)
from: Iggy Roca and Wyn Johnson, a course in phonology, Blackwell, 1999; p. 621
... 1981 Joni Mitchell 1982 Neil Young 1983 Glenn Gould 1986 Gordon Lightfoot 1987 The Guess Who[?] 1989 The Band 1990 Maureen Forrester[?] 1991 Leonard Cohen ...