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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _unblast(name2vals, name_map):
 """Helper function to lift str -> bool maps used by aiger to the word level. Dual of the `_blast` function."""

    def _collect(names):
        return tuple(name2vals[n] for n in names)

    return {bvname: _collect(names) for bvname, names in name_map}