[...] the relevant string [i.e. the portion of a stem to be copied by reduplication] could in principle be defined by any phonetic property (segmental or suprasegmental) or in terms of absolute linear position, or in terms of simply the number of adjacent segments involved; and it could also be left undefined (i.e. "reduplicate any one or more segments in the total string") reduplicated phonetic strings [...].
- Marantz (2004), Pag. 320