The one-one correspondence means only that if a particular sound 'x' in a given position is associated with a phoneme 'Y' we will associate with it,in the stated position,some sound 'x’', 'x’’',wich is substitutable for the original 'x' (i.e. has the same distribution as 'x').
- Harris (1951), a pag.5

Except where the elements at a particular level are stated to be otherwise, a one-one correspondence is maintained between spoken or heard speech and its representation in terms of the elements at any level.
- Harris (1951), a pag.364