Become is related to Adopt. Adopt is a synonym of Carry. Carry is a synonym of Maintain. Maintenance is etymologically related to Maintain. 
Fire requires Oxygen. Pistol can be used for Fire. 
Become <--RelatedTo--> Adopt <--Synonym--> Carry <--Synonym--> Maintain <--EtymologicallyRelatedTo-- Maintenance 
Oxygen <--HasPrerequisite-- Fire <--UsedFor-- Pistol 