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    my (%frame_lookup_by) = (
        21 => {
...
            value => sub {$minor_frame_data[0]*256 + $minor_frame_data
+[1] },        
        },
    );

my @minor_frame_data

$ref_frame_lookup_by->{21}->{value}->()

$ref_frame_lookup_by->{33}->{value}->()