Core is related to Middle. Middle is related to Related. Related is related to Royal. Royal is related to Roll. 
Italian is related to Garlic. Garlic is related to Onion. 
Core <--RelatedTo--> Middle <--RelatedTo--> Related <--RelatedTo--> Royal <--RelatedTo--> Roll 
Italian <--RelatedTo--> Garlic <--RelatedTo--> Onion 