Write code that creates processes that form a tree as follows: the main process is the root of the tree and has 3 child processes; only one of the children of the main process has 3 children of its own, with all the others having no child processes; one of the 3 siblings has 2 children, another has 1, and finally the last of the 3 siblings has none. Make each process print its own process id and that of its parent.

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