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  1. or download this
    #!/usr/bin/perl
sub aa{2}
...
say STDERR "$a==", aa;
say STDERR "$b==", bb;
say STDERR "$s==$t";
  2. or download this
    2==2
2==2
4==6
  3. or download this
    It can't be perl
It must be me
Yet what it is
I cannot see