[…] what is needed is the following rule: (26) [+—NP⁀Manner] → [+—NP] to be interpreted in the following manner: if (D, C) is a lexical entry with distinctive feature matrix D and complex symbol C containing [+—NP⁀Manner], then C is replaced by C', which contains each specified feature [αF] of C, where F≠ [—NP], and also the specified feature [+—NP] [...] (27) [+—φ⁀Manner] → [+—φ]. This is to be interpreted as follows: first, select any constant string as φ; second, interpret the result in the manner described in connection with (26) [...] We shall refer to the analogous syntactic rules (26), (27) as 'syntactic redundancy rules'. The redundancy rules, both phonological and syntactic, state general properties of all lexical entries, and therefore make it unnecessary to provide feature specifications in lexical entries where these are not idiosyncratic [...] Given a lexical entry (D, C), the phonological redundancy rules give a fuller specification to D, and the syntactic redundancy rules give a fuller specification to C.
- Chomsky (1969), a pag.167-169