Riddle:
You want Bob to have your phone number, but for some reason you can't ask him directly. You have to write Bob a note, and pass it to him through Lucy. Lucy can give you a note back with Bob's reply, but you don't want Lucy to know your phone number herself.
What will you write on the note to Bob?
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Answer:
This has several options for a creative mind. Our solution? Ask Bob to call you at a certain time, that way you'll know it's him and you can save the
phone number.