Get datable based a input datable by multiple distinct columns

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How can I get datable based on a input datable by multiple distinct columns?

My input
AAAA. 1111
AAAA. 2222
AAAA. 2222
BBBB. 1111
BBBB. 2222
BBBB. 1111
AAAA. 1111
BBBB. 1111

Desired output:
AAAA. 1111
AAAA. 2222
BBBB. 1111
BBBB. 2222

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