$2.$ Assume Bob sends an Elgamal encrypted message to Alice. Wrongly, Bob uses the same parameter i for all messages. Moreover, we know that each of Bob$$s cleartexts start with the number x$1=21($Bob$$s ID$).$ We now obtain the following ciphertexts

$($kE$,1=6,$y$1=17),$

$($kE$,2=6,$y$2=25).$

The Elgamal parameters are p $=31,\backslash$alpha $=3,\backslash$beta $=18.$ Determine the second plaintext