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
... from Europe by the sea route Thomas Gann[?], explorer Pierre Gaultier de Varennes et de la Vérendrye, (1685-1749), explorer H Hannu[?] - ancient Egyptian who ...