Dear Masters,
I have string of length in multiple of 3.

my $seq = "CTTCGAATT"; # in this case length of 9
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Is there a way I can split it into equal length of 3? Such that in the end I have this array:

$VAR = ["CTT", "CGA", "ATT"];
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In practice I have around 10 million of such string to break. I can always use iteration with 'substr' command. But it's very slow. Is there a faster way to do it?