Lookup [String,String]
Description
Finds all items in B whose first column matches A.
Input
A [STRING]: a list of strings to be searchedB [STRING,STRING]: a list of pairs to be searched withA
Output
B1B2 [STRING,STRING]:Bpairs, where the first column matches items inAB2 [STRING]:Bstrings, where the first column matches items inA
Output scores can be aggregated and/or normalized.