 
 <prompt> Which files dey consider non-standard, 640 or 320? Given di previous question, write a context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: ```Non-standard bit rates wey reach 640 kbit/s fit dey achieved with the LAME encoder and the freeformat option, but few MP3 players fit play those files. According to the ISO standard, decoders only need to fit decode streams wey reach 320 kbit/s.``` 