This eschews the computational problem that a grammar for compound nouns induces all possible binary bracketings, but is linguistically incorrect.
a similar problem arises in compound nouns that involve internal coordination: (NP (NN cotton) (CC and) (NN acetate) (NNS fibers)) We include the following (linguistically incorrect) rule in our grammar, which yields a default dependency structure corresponding to N/N coordination: This rule allows us to translate the above tree as follows: our current grammar does not distinguish between appositives and NP coordination, even though appositives should be analyzed as predicative modifiers.