Chemistry is related to Course. Course is related to Route. Route can be used for Planning. Planning is a type of Preparation. 
Phrase is part of Tune. Phrase is a synonym of Couch. Couch is related to Tv. 
Chemistry <--RelatedTo--> Course <--RelatedTo--> Route --UsedFor--> Planning --IsA--> Preparation 
Tune <--PartOf-- Phrase <--Synonym--> Couch <--RelatedTo--> Tv 