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How does a NAND astable work??

Help! For our first digital coursework for OCR AS Electronics we have to build a timing circuit. Mine is a NAND astable, which is the one our teacher didn't explain as he said he would probably get it wrong (typical!!). I've looked online but all of those seem to have only one capacitor, whereas mine has two (like the one below). Can anyone explain how it works?


Any help is much appreciated! Thank you in advance :smile:

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