chapter
If of
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The meeting will be canceled. This is true because if all flights are grounded, then the meeting will be canceled and all flights are grounded.

If all flights are grounded, then the meeting will be canceled. All flights are grounded. :. The meeting will be canceled. Modus ponens

CVal!9>or Invalid

11. Because the argument is valid, and if the argument is valid, then it must be sound, this argument is sound.