Police is a type of People. Clock can be used for People. Clock is related to Digital. Digital is the opposite of Continuous. 
Ongoing is related to Continue. Continue is related to Action. Action is related to Forbid. 
Police --IsA--> People <--UsedFor-- Clock <--RelatedTo--> Digital <--Antonym--> Continuous 
Ongoing <--RelatedTo--> Continue <--RelatedTo--> Action <--RelatedTo--> Forbid 