Function f(lst) { return lst.isEmpty() ? lst : node(lst.head (), f(lst.tail())); Function revdigits(lst) { return lst.isEmpty() ? 0 : lst.head() + revdigits(lst.tail())*10; f L1 is a list of digits, and revdigits(f(L1)) = 5483, what is the value of L1.tail().tail().head()? %3D

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