Patrol is etymologically related to Find. Find is related to Successful. Successful is a synonym of Effective. Effective is a synonym of Efficient. 
you are likely to find Tea in/at/on Refrigerator. 
Patrol --EtymologicallyRelatedTo--> Find <--RelatedTo--> Successful <--Synonym--> Effective <--Synonym--> Efficient 
Tea --AtLocation--> Refrigerator 