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I agree, the options with such patterns are quite debatable. In some cases, it can even happen that a person sees a perfectly reasonable pattern that the author did not anticipate. But, abstracting from the tasks themselves, other factors also play a role. Take, for example, the time limit, where the personality of the person being tested has a significant impact. Someone stubborn might get stuck on one of the tasks for a long time, unwilling to move on to other questions and answer them randomly. Another person, the ticking timer might make nervous, which will lead to making mistakes.