19. A method as in claim 18 , wherein the step of eliminating overlapping candidate phrases further comprises the steps of: dividing the text corpus into first and second complementary subsets of the text corpus; performing a preliminary parse into phrases of the first subset of the text corpus; creating a language model of the first subset of the text corpus based on the preliminary parse of the first subset of the text corpus; performing a parse into phrases of the second in subset of the text corpus based on the language model of the first subset of the text corpus; creating a language model of the second subset of the text corpus based on the parse of the second subset of the text corpus; performing a parse into phrases of the first subset of the text corpus based on the language model of the second subset of the text corpus; comparing the parse of first subset of the text corpus to the parse of the second subset of the text corpus; and modifying the set of candidate phrases in accordance with the comparison between the parse of first subset of the text corpus and the parse of the second subset of the text corpus.
19. A method as in claim 18 , wherein the step of eliminating overlapping candidate phrases further comprises the steps of: dividing the text corpus into first and second complementary subsets of the text corpus; performing a preliminary parse into phrases of the first subset of the text corpus; creating a language model of the first subset of the text corpus based on the preliminary parse of the first subset of the text corpus; performing a parse into phrases of the second in subset of the text corpus based on the language model of the first subset of the text corpus; creating a language model of the second subset of the text corpus based on the parse of the second subset of the text corpus; performing a parse into phrases of the first subset of the text corpus based on the language model of the second subset of the text corpus; comparing the parse of first subset of the text corpus to the parse of the second subset of the text corpus; and modifying the set of candidate phrases in accordance with the comparison between the parse of first subset of the text corpus and the parse of the second subset of the text corpus. 20. A method as in claim 19 , wherein the first and second subsets of the text corpus are of substantially equal size.