Morphemes may be classified by the positional relationship of their constituent parts into continuous and discontinuous. Morphemes of which the constituent phonemes (segmental and suprasegmental) are adjacent or simultaneous constitute the usual type. Indeed, the very fact of separation generally leads one to believe that the parts constitute separate morphemes unless (1) the units can be demonstrated to be separated by replacive or infixal forms or (2) the units never occurr without each other. In a form such as /sæŋ/ the phonemes /s...ŋ/ constitute a discontinuous morpheme.
- Nida (2004), Pag. 64