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Do you mean you don't follow how gaus, cow, bos, and bous could all be related to one another and how the word they came from was something like reconstructed *gwos?


and don't forget ox and bull!

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Or, do you not see how Sanskrit, English, Latin, and Greek are all related to one another, though not one of them is descended from another?


that's the bigger question, isn't it, and the answer(s) seems to be loaded with suppositions.