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  1. or download this
    my %hash;

...
sub { ++$_[0] }->( $hash{t5} );

print "$_\n" for sort keys %hash;
  2. or download this
    t2
t3
t5
  3. or download this
    if ($hash{foo}{bar})
  4. or download this
    if ($hash{foo} && $hash{foo}{bar})