Give isomorphic refinements of the two series. {(0, 0)} < (60Z) x Z < (l0Z) x Z

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Give isomorphic refinements of the two series.

{(0, 0)} < (60Z) x Z < (l0Z) x Z < Z x Z and {(0, 0)} < Z x (80Z) < Z x (20Z) < Z x Z

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