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use Text::CSV_XS "csv";

...

# convert to array of strings
my @list = map { $_->[0] } @$aoa;

use Text::CSV;
my @list = csv(in => "file.csv", fragment => "col=3").map(*[0]);

use Slang::Tuxic;
use Text::CSV;
my @list = csv (in => "file.csv", fragment => "col=3").map (*[0]);