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use strict;
use warnings;
...
print $a[1][2];  # Print element 2 of the array ref'ed by $a[1].
print $b[0][2];  # Print element 2 of the array named by $b[0].
print $b[1][2];  # Print element 2 of the array ref'ed by $b[1].

Can't use string ("1") as an ARRAY ref while "strict refs" in use at s
+cript.pl line 8.

unshift @a, [ ];
$a[0][0]=4;
$a[0][1]=5;
$a[0][2]=6;

unshift @a, [ 4, 5, 6 ];