I have a list of 128bit ciphertexts. I know that the plaintexts were encrypted with AES, 256bit key, ECB mode. Same key was used every time. So I know that if I see ciphertexts that are the same, the corresponding plaintexts are also the same. I know all possible plaintext values. Is it possible to derive the key that was used, or match plaintexts to ciphertexts?