How can I get not coin?

I'm a bit puzzled by your question. Could you possibly clarify what you mean by "not coin"? Are you inquiring about how to avoid acquiring a specific cryptocurrency? Or perhaps you're asking about a method to reverse a transaction where you unintentionally received coins? Could you elaborate a bit more on the context of your inquiry? If, for instance, you're seeking advice on how to steer clear of acquiring a certain cryptocurrency, that could involve various strategies depending on your situation. You might consider avoiding certain exchanges or wallets that offer the coin, or being mindful of the types of transactions you engage in to ensure you don't inadvertently receive it. However, if you're trying to understand how to reverse a transaction where you've received coins you didn't intend to, that's typically a more complex matter. Cryptocurrency transactions are generally designed to be irreversible, so reversing such a transaction might require contacting the sender or utilizing special mechanisms that might be available on certain platforms. Could you please provide more details or clarify your question? This would help me better address your concerns and offer more specific guidance.