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I thought it had five main engines, four with six chambers and the fifth with eight?

True, Sloppy nomenclature of me, it have 5 "engine" assemblies, with in total of 20 main chambers and 12 vernier chambers, a complex setup, Falcon 9 have, well, 9, all the same.

Ref RD-107: https://en.wikipedia.org/wiki/RD-107#/media/File:RD-107_Vost...

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