Corn is a type of Vegetable. Corn is related to Harvest. Harvest is related to Festival. Festival is related to Christmas. 
Alley is related to Street. Street is related to Way. 
Vegetable <--IsA-- Corn <--RelatedTo--> Harvest <--RelatedTo--> Festival <--RelatedTo--> Christmas 
Alley <--RelatedTo--> Street <--RelatedTo--> Way 