Server 2008 R2 RDP: limit max number of rdp connections per user group?

Hello everyone,
I have a Windows Server 2008 R2 with RDP installed.
I want to create a couple of user groups which will have 5 different users in each. Then I would like to limit RDP connections, let's say 2 connections for the first group and 3 connections for the second group. For example, if 2 users from Group 1 are connected
then when a 3rd user from Group 1 tries to connect it will be rejected to connect, but 3 users from Group 2 still can connect. Is it doable?
Thanks in advance.

Hi,
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