Long is related to Elephant. Elephant is related to Summer. 
Idea is related to Dream. Dream is related to Night. Night is a different concept from Morning. Morning is related to Meal. 
Long <--RelatedTo--> Elephant <--RelatedTo--> Summer 
Idea <--RelatedTo--> Dream <--RelatedTo--> Night <--DistinctFrom--> Morning <--RelatedTo--> Meal 