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
... Gazali Donnai Mueller syndrome[?] Al Gazali Hirschsprung syndrome[?] Al Gazali Khidr Prem Chandran syndrome[?] Al Gazali Sabrinathan Nair syndrome[?] ...