It has been argued, within a lexical phonology framework, that / e / has a back counterpart / d /.
2.
The above is based on " The Lexical Phonology of Slovak " and sources concerning the IPA, Slavic and Central European languages.
3.
Autosegmental phonology later evolved into feature geometry, which became the standard theory of representation for theories of the organization of phonology as different as lexical phonology and optimality theory.
4.
:: : The linguistic theory of Lexical Phonology ( which I mentioned in my comment in the Dec . 21 thread below ) also has a lot to say about " flied " vs . " flew ".