Usual is the opposite of Strange. Strange is a synonym of Odd. Odd is a synonym of Unusual. Unusual is a synonym of Remarkable. 
Pipe is a synonym of Mark. Mark is a synonym of Check. Check is a type of Attack. Attack is related to Aggression. 
Usual <--Antonym--> Strange <--Synonym--> Odd <--Synonym--> Unusual <--Synonym--> Remarkable 
Pipe <--Synonym--> Mark <--Synonym--> Check --IsA--> Attack <--RelatedTo--> Aggression 