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How to identify users that I blocked

In my client I need to mark all the users that I’'m subscribed on but I either blocked them from seen my status or never granted them with permission.

How can I identify them?

In order to block them I just sent unsubscribed packet.

I looked at http://www.xmpp.org/rfcs/rfc3921.html#substates but did not understand how to do it.