human biology - 8 abdominal muscles but 10 pack - Biology Stack Exchange

Simple question, how is it possible that there are people who appear to have 10 pack abdominal muscles while the human body has only eight?

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Are 8 pack abs possible? If so, which muscles are involved? - Quora

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Is It Possible to Develop 10-Pack Abs? [Best Exercises Included]

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Is it possible to have 9-pack abs? I have an 8-pack, but I also have a section of muscle on my left that outlines a 9th one. - Quora

6/8 Ab insertions and genetics? : r/bodybuilding

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Why do some people have 6 packs abs and some have 8 pack abs? - Quora

Are 8 pack abs possible? If so, which muscles are involved? - Quora