2)
int main()
{
fork();
fork();
fork();
fork()
printf("Hello world!");
}

 a.out─┬─a.out─┬─a.out─┬─a.out───a.out
                                  │       │       └─a.out
                                  │       ├─a.out───a.out
                                  │       └─a.out
                                  ├─a.out─┬─a.out───a.out
                                  │       └─a.out
                                  ├─a.out───a.out
                                  └─a.out
16 times;

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