Question: If A = {1, 2, 3, 4}, give an example of a relation R on A that is (a) Reflexive and symmetric, but not transitive

If A = {1, 2, 3, 4}, give an example of a relation R on A that is
(a) Reflexive and symmetric, but not transitive
(b) Reflexive and transitive, but not symmetric
(c) Symmetric and transitive, but not reflexive

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