What is {local dialing code} of {Houston} that is {country calling code} is {+1} ?
Is =+1 included for the local houston country dialing code
Does the local dialling code for Houston include the country calling code +1?
SELECT ?j WHERE { resource:Houston property:local_dialing_code ?b . FILTER ( ?v = +1 ) . ?b property:country_calling_code ?v . ?b property:local_dialing_code ?j }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q16555> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P473> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P474> <+1>
} 

SELECT ?obj WHERE { wd:Q16555 p:P473 ?s . ?s ps:P473 ?obj . ?s pq:P474 ?x filter(contains(?x , '+1')) }