y1
Warning: array_diff(): at least 2 parameters are required, 1 given in /in/t6duF on line 9
Warning: array_diff(): at least 2 parameters are required, 1 given in /in/t6duF on line 9
y2
Warning: array_diff(): at least 2 parameters are required, 1 given in /in/t6duF on line 10
Warning: array_diff(): at least 2 parameters are required, 1 given in /in/t6duF on line 11
Warning: array_diff(): at least 2 parameters are required, 1 given in /in/t6duF on line 11
y3