> the first complete reimplementation of Unix (BSD
BSD wasn't the first. The first BSD-related kernel to have no AT&T code was 386BSD version 0.0, released in March 1992. Coherent was released in 1980 (it was proprietary, but not based on AT&T Unix). Linux was released in September 1991 (initially proprietary, but it was GPLed in February 1992).
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