About: http://webisa.webdatacommons.org/403631420

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	So, you know that moving in z is the most expensive item which makes the z-1/z+1 your most expensive calls in terms of memory.
http://www.w3.org/ns/prov#wasQuotedFrom	gamedev.net