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Year         2 bytes     (0..65535)
subject code 2 bytes(?)  (0..65535)
author code  2 bytes(?)  (0..65535)
chemicals:   2 bytes per (0..65535)

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sub encode_base32 {
   ... based on encode_base64 ...
...
$file_name = encode_base32(compress_data(...));

(...) = decompress_data(decode_base32($file_name));