# Merge (String,String)

### Description
Match on `A2`=`B1`
Return A1,B2

### Input
- `A [OBJ,STRING]`: a list of pairs to be searched
- `B [STRING,STRING]`: a list of pairs to be merged with `A`

### Output
- `A1B2 [OBJ,STRING]`: from the first column of `A` only those items of which the second column matched with `B`, and the matching string from the second column of `B`

Output scores can be [aggregated](docs://score_aggregation) and/or [normalised](docs://score_normalisation).