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<input type="text" maxlength="4"name="17cardnumber">&nbsp;
<input type="text" maxlength="4"name="17cardnumber">&nbsp;
<input type="text" maxlength="4"name="17cardnumber">&nbsp;
<input type="text" maxlength="4"name="17cardnumber">&nbsp;

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## grab form input
my $query = CGI->new(); 
...
for my $field(@formfields) {
  $FORM{$field} = $query->param($field);
}