Classroom is related to Desk. you are likely to find Desk in/at/on Library. Library can be Dark. Dark is related to Hide. 
Suggestion is a synonym of Ghost. Ghost is a type of Travel. Reach entails/necessarily involves Travel. 
Classroom <--RelatedTo--> Desk --AtLocation--> Library --HasProperty--> Dark <--RelatedTo--> Hide 
Suggestion <--Synonym--> Ghost --IsA--> Travel <--Entails-- Reach 