I think you want this: 
    my @array = ( [ 1..3 ], [ 2..6 ] );

    for my $i (0 .. $#array) {
        for $k (0..$#{ $array[$i] }) {    ## This is the key.
            print $array[$i][$k];
        }
    }

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In reply to Re: Finding the length of an array of arrays by btrott
in thread Finding the length of an array of arrays by target

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