Existence is related to Be. Prove is a type of Be. Prove is related to Evidence. Lead is a type of Evidence. 
Involved is a synonym of Complex. Complex is a type of Feeling. Feeling is related to Sensation. 
Existence <--RelatedTo--> Be <--IsA-- Prove <--RelatedTo--> Evidence <--IsA-- Lead 
Involved <--Synonym--> Complex --IsA--> Feeling <--RelatedTo--> Sensation 