2. [Pseudorandom ciphertext security, again] Give an example of a cipher that is semantically secure, but not pseudorandom ciphertext secure. Remark: This shows that a converse to the proposition in the previous question is not true in general, i.e., not all semantically secure ciphers are also pseudorandom ciphertext secure. Hint: Your example does not have to be a scheme that is used in practice. In other words, it only has to be a made-up counterexample that proves your point. However, you must argue both properties for it, i.e., that your proposed cipher is semantically secure, and also that it is not pseudorandom ciphertext secure