Size is related to Quantity. Quantity is a different concept from Want. Want is related to Intend. 
Overcome is related to Climb. one thing you do when you Climb is Grab. 
Size <--RelatedTo--> Quantity <--DistinctFrom--> Want <--RelatedTo--> Intend 
Overcome <--RelatedTo--> Climb --HasSubevent--> Grab 