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by likpok 1133 days ago
It depends. Some people classify it as 6 tones, some as 9. The extra three are "entering <x> level tone", which are sort of shortened versions of a different tone.

So: some words end in a stop, which is sometimes counted as a different tone even though the pitch pattern isn't different. For example, consider fan versus fat.

https://en.wikipedia.org/wiki/Checked_tone