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Let A = {a,b,c,d}. Find an example of a relation on A that is (i) reflexive...

Let A = {a,b,c,d}. Find an example of a relation on A that is

(i) reflexive and symmetric.

(ii) not symmetric and not antisymmetric.

(iii) not symmetric but antisymmetric.

(iv) an equivalence relation

(v) a total order.

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