A Monte Carlo method for use with natural language understanding and speech recognition language models can include a series of steps. The steps can include identifying at least one phrase embedded in a body of text wherein the phrase can belong to a phrase class. An additional attribute corresponding to the identified phrase can be determined. The body of text can be copied and the identified phrase can be replaced with a different phrase selected from a plurality of phrases. The different phrase can belong to the phrase class and correspond to the attribute.
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