What is {instance of} of {cobalt} that is {followed by} is {nickel} ?
For what instance would nickel be followed by cobalt?
SELECT ?obj WHERE { wd:Q740 p:P31 ?s . ?s ps:P31 ?obj . ?s pq:P156 wd:Q744 }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q740> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P31> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P156> <http://wikidata.dbpedia.org/resource/Q744>
} 

Under what circumstance would a nickel be followed by cobalt?