Troop is a type of Unit. Company is a type of Unit. Company is related to Shell. 
Repair is a type of Condition. Ordinary is a type of Condition. Ordinary is related to Common. Common is related to Others. 
Troop --IsA--> Unit <--IsA-- Company <--RelatedTo--> Shell 
Repair --IsA--> Condition <--IsA-- Ordinary <--RelatedTo--> Common <--RelatedTo--> Others 