What output is produced by the following program?

public class MysteryReturn { 2. public static void main (String[] args) { 3 int x = 1, y = 2, z = 3; z = mystery (x, z, y); System.out.println (x + " " + y + " " + z); 6. x = mystery (z, z, x); System.out.println (x + + y + " " + z); 8. y = mystery (y, y, z); 9. System.out.println (x + " " + y + " " + z): 10 11 12 public static int mystery (int z, int x, int y) { 13 z--; 14 X = 2 y + z; 15 y = x - 1; 16 System.out.println (y + + z); 17 return x; 18 19