Strong is related to Hard. Hard is related to Iron. Iron is related to Task. 
Constant is related to Habit. Habit is related to Everyday. Everyday is a synonym of Daily. 
Strong <--RelatedTo--> Hard <--RelatedTo--> Iron <--RelatedTo--> Task 
Constant <--RelatedTo--> Habit <--RelatedTo--> Everyday <--Synonym--> Daily 