Addition is etymologically related to Added. Person wants (to) Added. Person wants (to) Proof. Proof is a type of Strengthen. 
Shrug is related to Shoulder. Shoulder is a type of Raise. Employee wants (to) Raise. Ceo is a type of Employee. 
Addition --EtymologicallyRelatedTo--> Added <--Desires-- Person --Desires--> Proof --IsA--> Strengthen 
Shrug <--RelatedTo--> Shoulder --IsA--> Raise <--Desires-- Employee <--IsA-- Ceo 