I don't think that would work. Whether or not something is a lie might only ever be known to the person who says/writes it. It could just be a mistake. Or part

I don't think that would work. Whether or not something is a lie might only ever be known to the person who says/writes it. It could just be a mistake. Or part of the truth so incomplete as to make someone believe something that isn't true. Human speech just doesn't lend itself to the type of formalism required for this to be possible. If you want the closest approximation, look at legal jargon, specifically for contracts: It is a set of speech standards that evolved over centuries in an effort to reduced ambiguity in transactions. As a result, it is extremely verbose to the point of incomprehensibility by outsiders, and it's still possible to deliberately misuse it without easy detection.