Availability is a synonym of Opening. Pocket is a type of Opening. you are likely to find Cash in/at/on Pocket. 
Troop is related to Small. Small is related to Corn. Corn is related to Oil. Oil is related to Line. 
Availability <--Synonym--> Opening <--IsA-- Pocket <--AtLocation-- Cash 
Troop <--RelatedTo--> Small <--RelatedTo--> Corn <--RelatedTo--> Oil <--RelatedTo--> Line 