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  1. or download this
    $ perl -E 'say []'
    ARRAY(0x7fd8278040b0)
    
  2. or download this
    $ perl -E 'say for [], {}, \"", sub {}'
    ARRAY(0x7ff6d60040b0)
    HASH(0x7ff6d602bf70)
    SCALAR(0x7ff6d602c948)
    CODE(0x7ff6d602c960)