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128.2.1.20
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ntp-1.ece.cmu.edu.
ac-ntp0.net.cmu.edu.
128.2.1.20
AC-NTP0.NET.CMU.EDU
ac-ntp0.net.cmu.edu.
128.2.1.20
AC-NTP0.NET.CMU.EDU
clock-1.cs.cmu.edu.
128.2.1.20
AC-NTP0.NET.CMU.EDU