I want to use a 2 dimensional array in a manner that is easy to initialize, but am unable to get it to work. here is what I'm attempting:

@arr[0] = (1,2,3);
@arr[1] = (4,5,6);
$index=1;

print "$arr[$index][2]";
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Any idea why this doesn't work? I've also tried copying the array to another array to no avail, for example  @anotherarray=@arr[1]