  There are further difficulties. Hybrid interpretivism gives us no reason to abandon a sharp distinction between the pre-interpretively given corpus of institutionally valid norms constituted by communication alone, on which interpretation operates, and the final set of norms that interpretation yields. It therefore makes it seem that the question whether the law is limited to the unprocessed input or extends to the processed output is merely verbal (Hart 1994, Postscript; Schauer 1996; Greenberg 2011a).