Display all gene-drug associations stored in pharmgkb database

Database: 
Statement: 

Display all gene and drug associations stored in pharmgkb database. A limit of results per page $number$ (e.g.100)

Query: 
select* where{ ?s a <http://bio2rdf.org/pharmgkb_vocabulary:drug-gene-Association> . ?s<http://purl.org/dc/terms/title>?label . ?s<http://bio2rdf.org/pharmgkb_vocabulary:drug>?drug . ?drug<http://purl.org/dc/terms/title>?label_drug . ?s<http://bio2rdf.org/pharmgkb_vocabulary:gene>?gene . ?gene<http://purl.org/dc/terms/title>?label_gene . } Limit ??number