Display all drug-drug associations stored in pharmgkb database

Database: 
Statement: 
Display all drug-drug associations stored pharmgkb database. A limit of results per page $number$ (e.g. 100).
Query: 
select* where{ ?DrugDrugAssociation a <http://bio2rdf.org/pharmgkb_vocabulary:Drug-Drug-Association> . ?DrugDrugAssociation<http://www.w3.org/2000/01/rdf-schema#label>?label . } limit ??number