Dirt is related to Garbage. you are likely to find Garbage in/at/on Floor. Classroom have Floor. 
Stability is related to Bone. Bone is related to Chew. Chew is the opposite of Bite. 
Dirt <--RelatedTo--> Garbage --AtLocation--> Floor <--HasA-- Classroom 
Stability <--RelatedTo--> Bone <--RelatedTo--> Chew <--Antonym--> Bite 