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  1. or download this
    use strict;
use warnings;
...
sub hi {
    print "hello World";
}
  2. or download this
    A => Scalar: 100
B => Scalar: 200
C => Array: first, second, third
D => Scalar: CODE(0x21bdf50)
E => Scalar: MainWindow=HASH(0x21d97ac)
  3. or download this
        elsif (ref($hash{$_})) {
        print "Unknown ref: $hash{$_}";
  4. or download this
    A => Scalar: 100
B => Scalar: 200
C => Array: first, second, third
D => Unknown ref: CODE(0x21be538)
E => Unknown ref: MainWindow=HASH(0x21d9e38)