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How to eliminate Duplicate columns

I have file has 3 columns like

column1         column2 column3 
Merchant City   13       AN
Merchant City   13       AN
Merchant City   13       AN

I want output like

column1         column2  column3 
Merchant City   13        AN

how to do this Please let us know..

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How to eliminate Duplicate columns

I have file has 3 columns like

column1         column2 column3 
Merchant City   13       AN
Merchant City   13       AN
Merchant City   13       AN

I want output like

column1         column2  column3 
Merchant City   13        AN

how to do this Please let us know..