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f(a) = b, f(b) = c, f(c) = d, f(d) = a
f(a) = b, f(b) = c, f(c) = b, f(d) = a
f(a) = b, f(b) = c, f(c) = d
f(a) = b, f(b) = c, f(c) = d, f(c) = a
ANS : 1
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