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PING www.ustc.org (104.247.81.99) 56(84) bytes of data.
64 bytes from 104.247.81.99: icmp_seq=1 ttl=60 time=401 ms
64 bytes from 104.247.81.99: icmp_seq=3 ttl=60 time=391 ms
--- www.ustc.org ping statistics ---
3 packets transmitted, 2 received, 33% packet loss, time 2439ms
rtt min/avg/max/mdev = 391.569/396.555/401.541/4.986 ms
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