Suggestion is a type of Idea. Suggestion is related to Propose. Propose is related to Reason. Reason is related to Slip. 
Instance is related to Class. Class is related to Lecture. Lecture is related to Professor. Professor is related to Instructor. 
Idea <--IsA-- Suggestion <--RelatedTo--> Propose <--RelatedTo--> Reason <--RelatedTo--> Slip 
Instance <--RelatedTo--> Class <--RelatedTo--> Lecture <--RelatedTo--> Professor <--RelatedTo--> Instructor 