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Just mark the graphs with "caffeine" and "no caffeine" rather than heads/tails.

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Nice read, one potential way to “blind” yourself from knowledge of whether you’re ingesting caffeine might be to flip a coin to determine regular black coffee vs decaffeinated coffee. Likewise for tea. Some connoisseurs would pick up on the taste difference but would the average person? Or, there are caffeine pills from drugstores which one could work with. Shall it be known to the next person... thanks for sharing!

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