my $start = time;
for (1..100) {
my @lookup; $#lookup = 0x3ffff;
$lookup[ $_ ] = [ ( $_ & 0x3f000 ) >> 12, ( $_ & 0xfc0 ) >> 6, $_ & 0x3f ]
    for 0 .. 0x3ffff;
}
printf "Generation took: %.12f seconds\n", ( time() - $start )/100;