1C CoRR+poonceonce+Once
2
3{}
4
5P0(int *x)
6{
7	WRITE_ONCE(*x, 1);
8}
9
10P1(int *x)
11{
12	int r0;
13	int r1;
14
15	r0 = READ_ONCE(*x);
16	r1 = READ_ONCE(*x);
17}
18
19exists (1:r0=1 /\ 1:r1=0)
20