Let A={1,2,3,4}.Consider the following r...

Let A={1,2,3,4}.Consider the following relations of A,
`R1={(1,2),(2,3),(3,4),(4,1)}`,
` R2={(1,1),(1,2),(1,3),(1,4)}`,
`R3={(1,1),(2,1),(3,1),(4,1)}`,
`R4={(1,2),(3,4),(4,1)}`.
State whether or not each of these relations is a function of A into A.

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