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<FORM METHOD="post" ACTION="../cgi-bin/findzip.cgi">
...

<INPUT TYPE=submit VALUE="Look up Zips and distances">
</FORM>

<FORM METHOD="post" ACTION="../cgi-bin/findzip.cgi">
      <input type="hidden" name="zip1" value="02110">
...
      </table>
    </form>

#!/perl/bin/perl

...
    return split /,/,$line;

}

00401,NY,Pleasantville,41.075800,-73.47300
00501,NY,Holtsville,40.485500,-73.02400
...
00626,PR,Caguas,18.141000,-66.02500
00627,PR,Camuy,18.290900,-66.50400
00628,PR,Carolina,18.225800,-65.57200