n. + reason >>共 241
security 48.43%
health 16.90%
safety 11.11%
business 3.26%
tax 1.72%
privacy 1.12%
cap 0.77%
salary 0.77%
policy 0.64%
space 0.39%
security + n. >>共 445
force 16.92%
official 8.09%
measure 3.87%
service 2.70%
concern 2.53%
source 2.32%
reason 2.31%
officer 2.29%
firm 2.22%
issue 1.82%
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