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Let A={1,\ 2,\ 3} . Write all one-one ...

Let `A={1,\ 2,\ 3}` . Write all one-one from `A` to itself.

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`f(1) = 1, f(2) = 2, f(3) = 3`
` f(1) = 2, f(2) = 3, f(3) = 1`
`f(1) = 3, f(2) = 1, f(3) = 2`
`f(1) = 1, f(2) = 3, f(3) = 2`
`f(1) = 3, f(2) = 2, f(3) = 1`
`f(1) = 2, f(2) = 1, f(3) = 3`
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