select user.user_id from user,groups,user_group,session
	where hash='' and
	    user.user_id=session.user_id and
	    user_group.group_id=groups.group_id and
	    user.user_id=user_group.user_id and
	    groups.group_id in (4) and
	    groups.group_id not in (null) and
	    end_time>1283503552

	    select user.user_id from user,groups,user_group
	    where user.user_id=user_group.user_id and
		user_group.group_id=groups.group_id and 
		groups.group_id in (4) and
		groups.group_id not in (null) and
	        ((user.name='' and 
			user.password='') or
	        groups.anonymous='Y')

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