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RE: Blocking
Yes, they can.
There's two solutions to your question.
#1: You re-add them (they won't have to accept or anything) just so you can click the block check box when you delete them again (or block them manually).
#2: Wait for them to send you a message. The chat will have a message telling you the person isn't in your contact list in the little yellow bar. Simply click block and close the chat.
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