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Here are the steps to create a PEM file using a public key from Curve25519:

1. Generate a Curve25519 public key. This can be done using a software library like OpenSSL or libsodium.

2. Convert the public key to base64 format. This can be done using a library like base64.js or base64url.

3. Create a PEM file with the following content:

-----BEGIN PUBLIC KEY----- <base64 representation="" of="" the="" public="" key=""> -----END PUBLIC KEY-----

1. Save the PEM file with a .pem extension.

Here is an example of what the PEM file contents should look like:

-----BEGIN PUBLIC KEY----- MCowBQYDK2VwAyEA7B1uhFXxLuIn/w/HHc3EZnVNG0G8tSTkXtQKyoNwbjc= -----END PUBLIC KEY-----