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. 
Rabbit is related to Straw. Straw is related to Tube. Tube is related to Hall. 
Used <--RelatedTo--> Mountain <--AtLocation-- Snake --AtLocation--> Habitat --IsA--> Company 
Rabbit <--RelatedTo--> Straw <--RelatedTo--> Tube <--RelatedTo--> Hall 