v. + problem >>共 361
have 22.63%
solve 9.06%
cause 5.52%
face 3.36%
address 2.77%
create 2.61%
pose 2.36%
fix 2.32%
resolve 2.12%
discuss 1.64%
combat 0.41%
combat + n. >>共 500
terrorism 10.06%
problem 6.21%
crime 5.45%
disease 3.53%
drug 2.54%
violence 2.40%
corruption 2.12%
poverty 1.74%
spread 1.60%
abuse 1.46%
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