I have data of over 10000 rows in following format:

1 a 3
1 a 4
1 a 5
1 b 6
1 b 8
77 a 3
77 a 6
77 b 9
77 b 12

I need this to become:
1 a 12
1 b 14
77 a 9
77 b 21

Many thanks for a Macro which can assist me in this

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T De Villier
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