Display all interactions between two entities from Irefindex

Database: 
Statement: 
Display all interactions between two entities. A limit of results per page $number$ (e.g.10)
Query: 
select* where{ ?s<http://www.w3.org/2000/01/rdf-schema#label>?label . ?s<http://bio2rdf.org/irefindex_vocabulary:interactor_a>?interactor_a . ?s<http://bio2rdf.org/irefindex_vocabulary:interactor_b>?interactor_b . } limit ??number