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1:  sub numtoname {
2:      local ($_) = @_;
3:      unless (defined $numtoname{$_}) {
...
6:      }
7:      return $numtoname{$_};
8:  }

foreach (1 .. 3) {
    foo($_ + 1);
    print "$_\n";
...
    $_ = shift;
    $_ += 7;
}

sub numtoname {
    my $address = shift;
    unless (defined $numtoname{$address}) {
...
    }
    return $numtoname{$address};
}