query: #title: Quick check if look like a soccer player or an association football referee
  # Complex constraint from [[Property talk:P2020]]
  #
  SELECT ?item {
    ?item wdt:P2020 []. 
    ?item wdt:P106 [].
    FILTER NOT EXISTS { ?item wdt:P106 wd:Q937857 }.
    FILTER NOT EXISTS { ?item wdt:P106 wd:Q859528 }.
    FILTER NOT EXISTS { ?item wdt:P106 wd:Q202648 }.
    FILTER NOT EXISTS { ?item wdt:P106 wd:Q628099 }.
    FILTER NOT EXISTS { ?item wdt:P106 wd:Q2445218 }.
    FILTER NOT EXISTS { ?item wdt:P413 [] }.  
  }