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Select contacts
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Show the group contacts by clicking the Group
Contacts icon
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Click the + button in line of the T button so
selected contacts will be added to that group
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Automatically, the selected contacts will each
have that on-the-fly group checkmarked.
Note: To remove (not
delete) the contacts from the group, just click the - button or the C
button to clear all contacts that has checkmarked from that particular
group.