struct s3 {};
struct s1 {
struct s3* s3;
struct s2* s2;
struct s4* s4;
};
struct s2 {
const struct s1 s1;
volatile struct s3 s3;
};
struct s4 {
struct s2 s2;
struct s1 s1;
};
int main() {
static struct s3 s3;
static struct s1 s1;
static struct s2 s2;
static struct s4 s4;
return 0;
}