To document an alien's change of status to permanent resident, DHS placed Form I-688
            EXT on the back of the alien's I-688 card. The sticker was evidence of permanent residence
            until the alien received Form I-551. It was
         
         
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                     temporary evidence of lawful admission for permanent residence and employment authorization; 
 
 
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                     valid for 1 year from the date of expiration on the reverse of the I-688.