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I’m afraid your interpretation of that phrasing is the only thing that doesn’t make sense here.
X has the core ingredient of Y?
If you take that literally, that would mean that X contains the core ingredient of Y.
In the case of KNO3, i guess is that oxygen?
Then you could also say: Air has the core ingredient of saltpeter?
Instead of going to KNO3, go to bird shit. From there, do your best to continue in a way that is logically consistent.
