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#!/usr/bin/perl -wl
use strict;
...
      scalar( (@arr,@a2z)[@idx] );
print        '@arr[@idx]:        ',
      scalar( @arr[@idx] );

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Useless use of private array in void context at scalar.pl line 9.
(@arr,@a2z):       26
(@arr,@a2z)[@idx]: 15
@arr[@idx]:        15