I understand this now.
In my DB class in college the professor told us this about one-2-many etc in a standard monotone chant (of course the accent was still there since the professor is Polynesian). Most of us repeated the information back without understanding it.
Since normalization is a complex thing, I would imagine the user should be shielded from it.
Assuming your database was in Access, would you design a form for data entry?
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