14. The computing system of claim 12 , wherein: the first score is based on a result of a second score plus a third score; the second score is based on a first measurement of a frequency of occurrence of the first word sequence in the text corpus; and the third score is based on the difference between the first vector and the second vector and a second measurement of a frequency of occurrence of the second word sequence in the text corpus.
14. The computing system of claim 12 , wherein: the first score is based on a result of a second score plus a third score; the second score is based on a first measurement of a frequency of occurrence of the first word sequence in the text corpus; and the third score is based on the difference between the first vector and the second vector and a second measurement of a frequency of occurrence of the second word sequence in the text corpus. 15. The computing system of claim 14 , wherein: the first score is further based on a fourth score plus the second score plus the third score; and the fourth score is based on a second difference between the first vector and a third vector representing a third usage of a third word sequence in the text corpus and a third measurement of a frequency of occurrence of the third word sequence in the text corpus.