recursive for parents

hello,
i have 5 model related in this way:
A belongs to B (B has many A)
B belongs to C (C has many B)
C belongs to D (D has many C)
D belongs to E (E has many D)

in the view of A i would show his parent B, C, D and E
which number should I set A ? (i didn't understood the page about
recursive in the cookbook.)
what is the best way for not include a lot of unusefull data?

thank you
pietro

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