Elementary is a different concept from Middle. Middle is related to Center. Center is related to Mentor. 
Suggestion is a type of Idea. Idea is related to Great. Great is related to Nature. Nature is related to Child. 
Elementary <--DistinctFrom--> Middle <--RelatedTo--> Center <--RelatedTo--> Mentor 
Suggestion --IsA--> Idea <--RelatedTo--> Great <--RelatedTo--> Nature <--RelatedTo--> Child 