How many {unit symbol} are for {liter} ?
How many unit symbols mean liter?
SELECT (COUNT(?obj) AS ?value ) { wd:Q11582 wdt:P5061 ?obj }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q11582> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P5061> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

Which is the number of unit symbols that mean liter?