Function is related to Think. one thing you do when you Contemplate is Think. 
Banking is related to Account. Account is related to Inside. Inside is a type of Surface. Surface is related to Seat. 
Function <--RelatedTo--> Think <--HasSubevent-- Contemplate 
Banking <--RelatedTo--> Account <--RelatedTo--> Inside --IsA--> Surface <--RelatedTo--> Seat 