For the Nexus 6P, 5X, we have MMB29P. The Nexus 6 and Nexus Player have build MMB29T. The Nexus 9 LTE and WiFi, and Nexus 5 have MMB29S. Finally, the Nexus 7 (2013) is MMB29O.
If you want the full breakdown on what was patched, check out this post from Google, which is this month’s Nexus security bulletin.
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