Food is related to Bean. Bean is related to Material. Material is related to Possession. 
Flip is a synonym of Pitch. Pitch is the opposite of Buy. Birthday would make you want to Buy. 
Food <--RelatedTo--> Bean <--RelatedTo--> Material <--RelatedTo--> Possession 
Flip <--Synonym--> Pitch <--Antonym--> Buy <--CausesDesire-- Birthday 