Question,
How do you know that the following two rows should have NAs ?

1     16/02/87     NA     NA
1     17/02/87     NA     NA


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On Tue, Mar 1, 2011 at 11:06 AM, Grant Gillis <grant.j.gil...@gmail.com>wrote:

> 1     16/02/87     NA     NA
> 1     17/02/87     NA     NA
>

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