Important is related to Special. Special is related to Event. Event is related to Reason. Reason is related to Cause. 
Claim is a synonym of Require. Require is related to Demand. Demand is related to Strong. 
Important <--RelatedTo--> Special <--RelatedTo--> Event <--RelatedTo--> Reason <--RelatedTo--> Cause 
Claim <--Synonym--> Require <--RelatedTo--> Demand <--RelatedTo--> Strong 