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http://www.w3.org/2000/01/rdf-schema#comment
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The proof step gives the formula as a result.
For some steps, like extraction of a statement from a formula,
it is essential to give the result formula in a proof to define
what step has been taken. For other steps, such as GMP inference,
the specification of the rule and bindings defines the result,
and so the proof can still be checked if the reason:gives ars
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