Direction is related to Slope. Slope is related to Physics. Physics is a different concept from Chemistry. Chemistry is related to Class. 
Port is related to Left. Left is related to Rest. Kneel is a type of Rest. the first thing you do when you Pray is Kneel. 
Direction <--RelatedTo--> Slope <--RelatedTo--> Physics <--DistinctFrom--> Chemistry <--RelatedTo--> Class 
Port <--RelatedTo--> Left <--RelatedTo--> Rest <--IsA-- Kneel <--HasFirstSubevent-- Pray 