Efficient is a synonym of Effective. Effective is similar to Actual. Actual is related to Fact. Fact is related to Matter. 
you are likely to find Log in/at/on Doctor. Log is part of Ship. Sheet is part of Ship. 
Efficient <--Synonym--> Effective <--SimilarTo--> Actual <--RelatedTo--> Fact <--RelatedTo--> Matter 
Doctor <--AtLocation-- Log --PartOf--> Ship <--PartOf-- Sheet 