What is the {currency} for {country} of {Biafra}
Which is the currency for the country of Biafra?
 select distinct ?sbj where { ?sbj wdt:P17 wd:Q178469 . ?sbj wdt:P31 wd:Q8142 } 
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P17> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q178469> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q8142> } 
what currency is established ofr the country of biafra?