# Overlap [Obj,String]

### Description
Computes set operations (intersection, union, difference) between inputs `A` and `B`.
Comparisons are performed tuple-wise, i.e. two inputs are equal when both columns are.
By default, no duplicate elimination is performed. Use `Score aggregation` parameter to change that.

### Input
- `A [OBJ,STRING]`: a list of objects (left operand)
- `B [OBJ,STRING]`: a list of objects (right operand)

### Output
- `INTERS [OBJ,STRING]`: the intersection between `A` and `B`
- `UNION [OBJ,STRING]`: the union between `A` and `B`
- `DIFF [OBJ,STRING]`: the difference between `A` and `B` (`A` - `B`)

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