11.   The sources said that strict police surveillance had prevented many dissidents from carrying on their campaign for democracy.

v. + dissident >>共 188
release 6.54%
detain 5.10%
arrest 5.10%
jail 3.19%
free 2.71%
imprison 2.23%
include 2.07%
take 2.07%
support 1.91%
prevent 1.75%
prevent + n. >>共 1204
attack 3.54%
violence 1.93%
spread 1.72%
people 1.65%
company 0.97%
infection 0.92%
recurrence 0.88%
problem 0.87%
cancer 0.87%
disease 0.85%
dissident 0.05%
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