in the spring of 2018 from a colleague of mine. It had
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，这一点在体育直播中也有详细论述
### p(n) is hmac-sha256(key=secret, data=a(n)+seed)
PNY Pro Elite V2 (256 GB) for $60: This sliding drive has a plastic cover to protect the USB-A plug, and was our compact pick for a while. It performed well (read and write speeds hovered around 415 MB/s and 425 MB/s) in my tests, and has an opening for a lanyard or keyring. I tested the 256-GB drive, but there are 512-GB and 1-terabyte models.