4. The media of claim 1 , wherein the plurality of product class specific tokens is determined by identifying tokens that have a brand count above a threshold number, wherein the brand count is a number of brand specific tokens to which the tokens are related.
4. The media of claim 1 , wherein the plurality of product class specific tokens is determined by identifying tokens that have a brand count above a threshold number, wherein the brand count is a number of brand specific tokens to which the tokens are related. 5. The media of claim 4 , wherein a first token is related to a second token if the association rule score is above a threshold.