you are likely to find Door in/at/on Bus. Door is related to Hallway. Hallway is a type of Room. Room is related to School. 
Variation is a type of Activity. Release is a type of Activity. Release is the opposite of Contain. 
Bus <--AtLocation-- Door <--RelatedTo--> Hallway --IsA--> Room <--RelatedTo--> School 
Variation --IsA--> Activity <--IsA-- Release <--Antonym--> Contain 