Examlex
One reason purchasing power parity does not exactly hold is that many goods are not traded internationally.
Unless
Unless is a conjunction used to introduce a conditional clause, specifying an exception or a circumstance under which a statement does not apply.
Valid Inference
A logical conclusion drawn from premises that are accepted as true, ensuring the conclusion necessarily follows from them.
Copernicus
A Renaissance mathematician and astronomer who formulated a model of the universe that placed the Sun rather than the Earth at its center.
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