Patrol is a type of Protection. Protection is a synonym of Fence. 
Clay is related to Material. Material is related to Substantial. Substantial is a synonym of Real. Real is related to Credibility. 
Patrol --IsA--> Protection <--Synonym--> Fence 
Clay <--RelatedTo--> Material <--RelatedTo--> Substantial <--Synonym--> Real <--RelatedTo--> Credibility 