16. The non-transitory computer readable medium of claim 15 , wherein the instructions that cause performance of step (c) comprise instructions which, when executed, cause using heuristic rules to group the set of deep tokens appearing in the plurality of tokens.
16. The non-transitory computer readable medium of claim 15 , wherein the instructions that cause performance of step (c) comprise instructions which, when executed, cause using heuristic rules to group the set of deep tokens appearing in the plurality of tokens. 18. The non-transitory computer readable medium of claim 16 , wherein the instructions that cause using the heuristic rules comprise instructions which, when executed, cause considering a frequency with which a given deep token appears within the plurality of tokens.