SnowmanV2
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Regarding the clue about Alex – it’s difficult to find any supporting evidence. The matches could be phosphorus-based, which would lead to a different conclusion, or Tox could have used a different oxidizer in the clue (potassium dichromate, pyrolusite, etc.), or even a flammable substance, which would actually be more logical. The clue is good, but I like the one about Plyukhin more.