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I find that in some strengthen/weaken questions, the right answers are some "other consideration" that influence the conclusion, but are irrelevant to premise. Consider this weaken question:
https://7sage.com/lsat_explanations/lsat-26-section-3-question-06/
This phenomenon is also common in "shield" type of NA question. The answers are something that is not talked in the stimulus.
In these case, can we say that, we are not strengthen/weaken the support that premise giving to conclusion, but strengthen/weaken the conclusion independently?