13. The system of claim 12 , wherein the one or more processors are further operable to produce a first score to represent the strength measure based on the occurrence, location, or attributes associated with the first term or the one or more second terms, wherein the group of second terms are collected based on the first score.
13. The system of claim 12 , wherein the one or more processors are further operable to produce a first score to represent the strength measure based on the occurrence, location, or attributes associated with the first term or the one or more second terms, wherein the group of second terms are collected based on the first score. 14. The system of claim 13 , wherein the first score is produced based on the number of text units that contain the first term or the one or more second terms, or the number of occurrences of the first term or the one or more second terms in the text units.