Cover is a type of Fire. Fire can Kill. one thing you do when you Kill is Laugh. 
Understanding is related to Confusion. Confusion is related to Mental. Mental is related to Distinguish. 
Cover --IsA--> Fire --CapableOf--> Kill --HasSubevent--> Laugh 
Understanding <--RelatedTo--> Confusion <--RelatedTo--> Mental <--RelatedTo--> Distinguish 