How many {time-weighted average exposure limit} are for {benzene} ?
How many time-weighted average exposure limits does Benzene have?
Benzene has how many time-weighted average exposure limits?
SELECT ( COUNT ( ?m ) AS ?e ) { resource:benzene property:time-weighted_average_exposure_limit ?m }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q2270> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2404> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q2270 wdt:P2404 ?obj }
8