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Consider all functions f : {1, 2, 3,4} -...

Consider all functions `f : {1, 2, 3,4} -> {1, 2, 3,4}` which are one-one, onto and satisfy the following property: if `f(k)` is odd then `f(k+ 1)` is even, `k=1, 2, 3`. The number of such functions is

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