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Decapitation is more of a straightforward description of an action. If it's a clue, it's unclear what it has to do with the Tevet flower.
I just don't know why I brought this up... theoretically... Let's say Nefela killed someone, and she has a phrase from Voland, where Voland speaks to a severed head. Then, she writes about the decapitation in the newspaper and places a hint – the Tevet flower – which, let's say, leads to the cultivation of tobacco at Nefela's place.
This is just a hypothetical scenario for discussion.