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"Teachers use chalk daily." - definitely a true statement. Some amount of teachers do.

"All teachers use chalk daily." - definitely a false statement. Certainly some teachers don't.

Again, English 101.

No, "Teachers use chalk daily" is nowhere near true. It would've been mostly true 30 years ago, before whiteboards, and now it's definitely not the case. The hair you're splitting only works when the approximation that omits the "all" is close to 100%.

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