1C WRC+poonceonces+Once
2
3{}
4
5P0(int *x)
6{
7	WRITE_ONCE(*x, 1);
8}
9
10P1(int *x, int *y)
11{
12	int r0;
13
14	r0 = READ_ONCE(*x);
15	WRITE_ONCE(*y, 1);
16}
17
18P2(int *x, int *y)
19{
20	int r0;
21	int r1;
22
23	r0 = READ_ONCE(*y);
24	r1 = READ_ONCE(*x);
25}
26
27exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0)
28