What was most difficult?
The most confusing thing for me was on the first example, the addition and multiplication tables are a bit confusing. Namely, why is it arranged 0,6,2,8,4? Is there a special reason or is the author just showing that it doesn't matter which order we make the table? It threw me off.
Reflection
I find myself wondering, "what is the point of this?" What is this leading up to/why do we care about this? Is this "useful" or is this just a mathematician's playground to make up rules for the sake of doing it?
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