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  1. or download this
    #!/usr/bin/perl -wl
    use strict;
    ...
          scalar( (@arr,@a2z)[@idx] );
    print        '@arr[@idx]:        ',
          scalar( @arr[@idx] );
    
  2. or download this
    Useless use of private array in void context at scalar.pl line 9.
    (@arr,@a2z):       26
    (@arr,@a2z)[@idx]: 15
    @arr[@idx]:        15