Why Conway 13 base function is Baire two?

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I'm writing my thesis about Baire Classes. I want to prove that the 13 base Conway function is in the Baire two class. I need a clear proof of this fact, a proof in which is described how to "build" a sequence of Baire one functions that converges pointwise to our function, or every other way that DOESN'T involve Borel Spaces. Thank you!