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sub DefaultHashValue {
    my %h = @_;
...
    my @k = sort values %h;
    return $r{ $k[0] }
}

sub sort_keys {
    my %h = @_;
    my @s = sort { $h{$a} cmp $h{$b} } keys %h;
    return $s[0]
}

sub min {
    my %h = @_;
...
    $h{$_} lt $h{$min} and $min = $_ for keys %h;
    return $min
}

#!/usr/bin/perl
use warnings;
...
               min  => sub { min(%h)  },
             });
}