7. An apparatus, comprising: a processor configured to: digitally sample an analog waveform voice signal; examine a tagged input text string based on the digitally sampled analog waveform voice signal for at least one set of substitutions based on content of the input text string; and when the input text string is a substring of a previously tagged input text string and the input text string and at least one additional input text string share a common pre-assigned tag identifier stored in a memory location, eliminate at least one of the input text string and the at least one additional input text string from a natural language grammar.
7. An apparatus, comprising: a processor configured to: digitally sample an analog waveform voice signal; examine a tagged input text string based on the digitally sampled analog waveform voice signal for at least one set of substitutions based on content of the input text string; and when the input text string is a substring of a previously tagged input text string and the input text string and at least one additional input text string share a common pre-assigned tag identifier stored in a memory location, eliminate at least one of the input text string and the at least one additional input text string from a natural language grammar. 10. The apparatus of claim 7 , further comprising: a memory location configured to store a pre-assigned tag identifier.