1C SB+poonceonces
2
3{}
4
5P0(int *x, int *y)
6{
7	int r0;
8
9	WRITE_ONCE(*x, 1);
10	r0 = READ_ONCE(*y);
11}
12
13P1(int *x, int *y)
14{
15	int r0;
16
17	WRITE_ONCE(*y, 1);
18	r0 = READ_ONCE(*x);
19}
20
21exists (0:r0=0 /\ 1:r0=0)
22