SPARQL to get all triples in a ‘provenance’ named graph representing data set

Database: 
Statement: 
SPARQL to get all triples in a ‘provenance’ named graph representing data set $dataset$ (e.g., HGVRS17).
A limit number of results $number$ (e.g.10)
Query: 
select * from named <http://purl.org/gwas/np/??dataset#pr> where { graph ?g {?s ?p ?o} } limit ??number