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auschwitz was divided to auschwitz 1 - the work camp for the privileged prisoners, auschwitz 2 - birkenau a death camp/medical experiments/harsh conditions labor camp, and auschwitz 3 - monowitz, a work camp with better conditions than Birkenau.
https://en.wikipedia.org/wiki/Auschwitz_concentration_camp#Auschwitz_II-Birkenau