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Describe an example for each of the following. If no such example exists, explain your answer. (a) A nonabelian group of order 12 with

Describe an example for each of the following. If no such example exists, explain your answer. (a) A nonabelian group of order 12 with a subgroup of order 3. (b) A commutative ring without unity. (c) A finite integral domain. (d) A relation that is reflexive, transitive but not symmetric.

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