At one extreme: if you’re making a prototype or quick script, I reckon all errors are unexpected. You might decide not to handle problems with the network, filesystem, or user input. Who cares? This is just a little script or idea.
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Number (8): Everything in this space must add up to 8. The answer is 3-4, placed horizontally; 4-6, placed horizontally.
// paging, with the ascending order