Slope is related to Will. Will is related to Would. Would is related to Do. Do is related to Drive. 
Bubble is related to Liquid. Vaccine is a type of Liquid. 
Slope <--RelatedTo--> Will <--RelatedTo--> Would <--RelatedTo--> Do <--RelatedTo--> Drive 
Bubble <--RelatedTo--> Liquid <--IsA-- Vaccine 