Stage is a type of Scene. Scene is related to Event. Event is related to Happen. Happen is related to Occur. 
Used is related to Mountain. you are likely to find Snake in/at/on Mountain. you are likely to find Snake in/at/on Habitat. Habitat is a type of Company. 
Stage --IsA--> Scene <--RelatedTo--> Event <--RelatedTo--> Happen <--RelatedTo--> Occur 
Used <--RelatedTo--> Mountain <--AtLocation-- Snake --AtLocation--> Habitat --IsA--> Company 