Complete is a different concept from Empty. Empty is a synonym of Clean. 
Patrol is etymologically related to Find. Person wants (to) Find. you are likely to find Characteristic in/at/on Person. Characteristic is a synonym of Attribute. 
Complete <--DistinctFrom--> Empty <--Synonym--> Clean 
Patrol --EtymologicallyRelatedTo--> Find <--Desires-- Person <--AtLocation-- Characteristic <--Synonym--> Attribute 