The best explanation for how magic works in the wizarding world is how programming works, with each spell being like a function call or executing a script. Common spells are just common functions like push, slice, map, concat etc.
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Oh I think I see what you mean. Access to execute scripts is genetically determined. Execute access.
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Elaborate? Harry was able to execute Sectumsempra just by reading Snape's notes in his book, which seems like the spell is somehow globally scoped.
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