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Blazegraph(TM) RDF Test Suites

There is a newer version: 2.1.4

PREFIX rdf: 
PREFIX rdfs: 
PREFIX foaf: 

select ?x ?o ?y ?z
where {
  ?x rdf:type foaf:Person
  OPTIONAL {
  ?x rdfs:label ?o
  }
  OPTIONAL {
  ?x foaf:knows ?y .
  ?y foaf:knows ?z .
  FILTER ( ?z != ?x )
  }
}