I would like to present here an amazing word cluster which I have found in Serbian and Irish. The word cluster is related to heat (warmth), the most basic sources of heat and the most basic uses of heat. The fact that this word cluster relates to such basic terms, suggests that it originated very early, maybe even in Neolithic and maybe even in Paleolithic time. Apart from Serbian and Irish, this word cluster is found in part in other "Slavic" languages and in traces in other "Celtic" languages. I would really appreciate any additional information regarding the existence of the words from this word cluster in other languages.
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