#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11140267
use warnings;

my $file = <<END;
702005010683593,5016683593,7020000024140
702005010640383,5016640383,7020000024150
310005010532143,5016532143,7020000034001
702005010637702,5016637702,7020000034001
702005010608274,5016608274,7020000034013
702005010608274,5016608274,7020000034013
310005010609604,5016609604,7020000034013
702005010510869,5016510869,7020000034013
702005010551513,5016551513,7020000034130
702005010551513,5016551513,7020000034130
702005010679719,5016679719,7020000034222
702005010527052,5016527052,7020000034222
702005010645458,5016645458,7020000034222
END

open my $fh, '<', \$file or die; # FIXME change for your file
my $thirty = 1; # FIXME 1 for testing, should be 30
my (%answer, %lines);
$lines{ /,(.+)/ ? $1 : die "bad data <$_>" }++ while <$fh>;
for ( keys %lines )
  {
  my ($value, $key) = split ',';
  $lines{$_} > $thirty and push @{ $answer{$key} }, $value;
  }
use Data::Dump 'dd'; dd \%answer;