Be sure to refer to overview.txt and for more high-level details refer to https://www.bls.gov/cpi/data.htm and https://www.bls.gov/cpi/methods-overview.htm — you might also find relevant information on weighting here https://www.bls.gov/cpi/tables/relative-importance/home.htm

Typical entries in the AP (Average Price) series look like: APU0000701322 2015 M05 1.335

where APU0000701322 is a pound of spaghetti or macaroni, and M05 is May.

I thought of telling you off for spreading misinformation to incite, but I figured that saying it this would gets my point across more strongly.