Restoring old revision of "Property:P536"

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@@ Property / subproperty of @@
-P4i is time-span of
@@ Property / subproperty of: P4i is time-span of / rank @@
-Normal rank
@@ Property / inverse of @@
-O31 has validity time-span
@@ Property / inverse of: O31 has validity time-span / rank @@
-Normal rank