Toss the coin twice.
Let Tails-Heads, Heads-Tails and Tails-Tails correspond to the three choices. (so tails-heads = cookies, heads-tails = ice cream, tails-tails = brownie)
So, first time I flip the coin I get tails. So I know my choices are now cookies or brownies. Once I flip again I get heads. So the dessert will be cookies!)
And if you get Heads-Heads, just repeat the toss.
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