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  1. or download this
    my $AoA = pack 'C*', map @$_, @AoA;

...
my $pat = '[^'.( join '', map quotemeta, pack 'C*', @$omit ).']{4}';
my $re = qr/\G(?:.{4})*?($pat)/s;
my @matches = map [ unpack 'C*', $_ ], $AoA =~ /$re/g;
  2. or download this
    my $AoA = pack '(C4S)*', map { @{ $AoA[$_] }, $_ } 0..$#AoA;

...
my $pat = '[^'.( join '', map quotemeta, pack 'C*', @$omit ).']{4}';
my $re = qr/\G(?:.{6})*?$pat(..)/s;
my @matches = @AoA[ map unpack 'S', $AoA =~ /$re/g ];