BrainteasersSecret Message
You want to send a secret message to your friend Alex in the mail.
But you suspect a spy has access to your mail!
So you put your message in a box with a lock.
But if you send a key then the spy might find it too, and make a copy!
How can you get your message through securely?
![](https://www.datocms-assets.com/34817/1701710226-unknown-12.jpeg)
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