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var g:int;
procedure {:yields} {:stable} PB()
modifies g;
{
g := g + 1;
}
procedure {:yields} {:stable} PC()
ensures g == 3;
{
g := 3;
yield;
assert g == 3;
}
procedure {:yields} {:stable} PD()
{
call PC();
assert g == 3;
yield;
}
procedure {:entrypoint} {:yields} Main()
{
while (true)
{
par PB() | PC() | PD();
}
}
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