Orange is a different concept from Lemon. Lemon is related to Egg. 
Board is related to Teaching. Teaching is related to Professor. Professor is related to College. College is related to Campus. 
Orange <--DistinctFrom--> Lemon <--RelatedTo--> Egg 
Board <--RelatedTo--> Teaching <--RelatedTo--> Professor <--RelatedTo--> College <--RelatedTo--> Campus 