my %rhash = reverse %hash;
my %fh;
foreach my $num (keys %rhash)

[download]

Since you only need the unique keys from %hash you only really need an array: 

my @keys = keys %{{ reverse %hash }};
my %fh;
foreach my $num ( @keys )

[download]

In reply to Re^2: Compare hash with arrays and print by jwkrahn
in thread Compare hash with arrays and print by ad23

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