Master entails/necessarily involves Understand. Master is related to Captain. Captain is related to Occupation. 
Investigator is a type of Expert. Expert is a type of Person. Person is related to General. General is related to Art. 
Understand <--Entails-- Master <--RelatedTo--> Captain <--RelatedTo--> Occupation 
Investigator --IsA--> Expert --IsA--> Person <--RelatedTo--> General <--RelatedTo--> Art 