Make invented examples visibly hypothetical
A made-up example can explain an idea clearly without pretending to document a real event. Introduce a fictional shop, sample learner or assumed number as hypothetical. That small label lets the example do its teaching job while preventing illustrative details from becoming accidental facts.
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Separate illustration from evidence
You invent a shop with twelve shelves to demonstrate a way of organising stock. The exact shelf count is useful for the example, but it is not a researched fact about a real business.
A hypothetical example needs to be identifiable as one. Phrases such as suppose a shop or in this simplified example make its status clear.
The assumptions should also fit the explanation. If you ignore complications to keep the mechanism visible, say which simplifications matter.
An example can demonstrate how a rule operates under stated conditions. It cannot, by itself, establish how frequently the situation occurs in real life. Keeping those roles separate allows concrete teaching without manufacturing evidence or implying that invented details were observed.