Question: How many divisions have safety priority in the City of Redacre spending?
SPARQL:
 select count(distinct(?division)) from <http://linkedspending.aksw.org/city-of-redacre-spending> { ?obs qb:dataSet ls:city-of-redacre-spending. ?obs lso:city-of-redacre-spending-to ?division. ?obs lso:city-of-redacre-spending-priority <https://openspending.org/city-of-redacre-spending/priority/safety>. }