71.   Pakistan authorities have sent extra troops to seal the border with Afghanistan near Tora Bora and prevent any escape.

72.   Police deployed around the prison continued to fire tear gas grenades to prevent escapes.

73.   Riot police, meanwhile, sealed off the compound to prevent escapes.

74.   Riot police sealed off the compound to prevent escapes.

75.   Security was also beefed up at all exits from the country to prevent the escape of the four-man commando which sprayed the tourists with automatic weapons fire.

v. + escape >>共 125
prevent 12.46%
make 12.13%
plan 5.98%
have 4.98%
offer 4.49%
block 4.15%
seek 3.49%
attempt 3.32%
plot 3.16%
provide 2.66%
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%
escape 0.34%
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