About: http://webisa.webdatacommons.org/408979177

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Thanks that is useful link and solve all the parts except minimizing how far the people have to move to swap partners and what this problem is called in graph theory
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com