Boast is a synonym of Blow. Blow is related to Air. Air is a synonym of Appearance. 
you are likely to find Bag in/at/on Ship. you are likely to find Bag in/at/on Mall. you are likely to find Teenager in/at/on Mall. Teenager is a synonym of Youth. 
Boast <--Synonym--> Blow <--RelatedTo--> Air <--Synonym--> Appearance 
Ship <--AtLocation-- Bag --AtLocation--> Mall <--AtLocation-- Teenager <--Synonym--> Youth 