Yes, this is why I typically stick with easy and likely to be considered questions.

Again, not a rigorous explanation. Just an easy one. For the advanced algo, I typically word it as imagine if the front desk had a notesheet that they would tick next to "person carrying a backpack" and/or "female" and/or "male" and then I could run my candidate through the questions related to them and see if they all have non-zero quantities of people.

But, again, just a mental way of thinking about this in analogy. If you aren't the kind that needs/wants analogies, this is worthless. On that I fully agree.