Warn is a type of Order. Order is related to Come. Come is related to Debut. Debut is related to Time. 
Past is a different concept from Current. Current is related to Rapid. 
Warn --IsA--> Order <--RelatedTo--> Come <--RelatedTo--> Debut <--RelatedTo--> Time 
Past <--DistinctFrom--> Current <--RelatedTo--> Rapid 