As pointed out, you probably want $" instead of $,, but in reality, you want to join those elements and print them that way:
my @array =
'abc', 'def', 'ghi', 'jkl', 'mno', 'pqr', 'stu', 'vwx', 'yz '
my $output = join '', @array[2,4];
Why is that better? Because nobody knows what $" is, but everyone knows what join() is. Always write your software to be as readable as possible :)
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