What is displayed by the program fragment below?
```
int a = 3, b = 9;
int *pa, *pb, *pc;
pa = &a;
pb = &pb;
pc = pa;
pa = pb;
pb = pc;
printf(“%4d %4d %4d %4d %4d\n”, a, b, *pa, *pb, *pc);
```
3 9 9 3 3
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