About: http://webisa.webdatacommons.org/236803515

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	Each square is a table or grid in which a number or symbol appears only once in each row and column.
http://www.w3.org/ns/prov#wasQuotedFrom	merschat.com