Propose is related to Engagement. Commitment is a type of Engagement. Commitment is a type of Cooperation. 
Teen is a synonym of Adolescent. Adult is etymologically related to Adolescent. Adult is a synonym of Dirty. you are likely to find Dirty in/at/on Ground. 
Propose <--RelatedTo--> Engagement <--IsA-- Commitment --IsA--> Cooperation 
Teen <--Synonym--> Adolescent <--EtymologicallyRelatedTo-- Adult <--Synonym--> Dirty --AtLocation--> Ground 