3 Let L := be the empty language, and for each n > 1, let Sn = (3x1)... (5xn) | A(Xi = x;) ^ ^ (Li + x;) 2). = i 1} are elementary equivalent. 3 Let L := be the empty language, and for each n > 1, let Sn = (3x1)... (5xn) | A(Xi = x;) ^ ^ (Li + x;) 2). = i 1} are elementary equivalent<><>