Get a count of all silver coins associated with RRC types

gistfile1.sparql

PREFIX nm:	<http://nomisma.org/id/>
PREFIX nmo:	<http://nomisma.org/ontology#>
PREFIX dcterms:	<http://purl.org/dc/terms/>

SELECT (count(?objects) as ?count) WHERE {
?types nmo:hasMaterial nm:ar ;
  dcterms:source nm:rrc .
?objects nmo:hasTypeSeriesItem ?types ;
  a nmo:NumismaticObject
}