How do you merge two groups together?

Version 2

    To merge two groups together, you will have to head into one of these groups and select all contacts in this group.

    Select Add people to group

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    A window pane will appear verifying this group merge. Here you will have to select the group you would like to move these contacts to.

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    Note: To make sure there are no duplicates, you will want to go back and delete this old group.