Table for the 4 triples for predicate cpack:author in graph https://cliopatria.swi-prolog.org/packs/cluster_search

Subject	Object
?:cluster_search	_:Chris Dijkshoon
?:cluster_search	_:Jacco van Ossenbruggen
?:cluster_search	_:Jan Wielemaker
?:cluster_search	?:me