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  1. or download this
        print <<  "ENDTAG"; # works
    print <<  'ENDTAG'; # works
    print <<   ENDTAG;  # syntax error!
  2. or download this
    print "printing here doc:\n";
print <<"ENDTAG";
...
printing here doc:
This text has 0 leading spaces
    This text has 4 leading spaces
  3. or download this
    {
    print "printing here doc:\n";
...
    This text has 4 leading spaces
ENDTAG
}
  4. or download this
    {
    print "printing here doc:\n";
...
OUTPUT:
printing here doc:
    This text has 4 leading spaces