Identify comparable and incomparable sets

The sets A = {1, 2} and B = {1, 2, 3} are as A ⊆ B. On the other hand, the sets C = {1, 2, 3} and D = {2, 3, 4} are .

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Reference

Introduction to Differential Calculus (Systematic Studies with Engineering Applications for Beginners) - 2012