#include <stdio.h>
#include <unistd.h>
int main()
{
int i;
for(i=0; i<3; i++)
fork();
return 0;
}
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#include <stdio.h>
#include <unistd.h>
int main()
{
int i;
for(i=0; i<3; i++)
fork();
printf("Hello world!\n");
return 0;
}