Hugh nodded, a grin lighting up his face. "Design decisions, right? Anyway, the second group thinks that replicative drift is caused by the No-Cloning Theorem. In other words, the second Bob isn’t identical to the first because it would violate Quantum Mechanics." He gazed pensively into middle distance for a few mils. "It has been further suggested that if the No-Cloning Theorem is applicable to replicants, then the No-Deletions Theorem probably is as well. And you know what that implies."