A few other ways of accessing your rows and elements are:

use strict;
use warnings;

my @list=(["1","2","3"],["a","b","c"]);

print "A row:\n";
for my $element (@{$list[0]}) {
    print "$element\n";
}

print "or stringify row: @{$list[0]}\n\n";

print "All rows:\n";
for my $row (@list) {
    print "@$row\n";
}

print "\nAll rows by index:\n";
for my $rowIndex (0 .. $#list) {
    print "row $rowIndex: @{$list[$rowIndex]}\n";
}
[download]

Prints:

A row:
1
2
3
or stringify row: 1 2 3

All rows:
1 2 3
a b c

All rows by index:
row 0: 1 2 3
row 1: a b c
[download]