a. + protection >>共 643
environmental 15.91%
legal 5.96%
copyright 3.59%
better 3.17%
constitutional 3.06%
patent 2.99%
special 2.72%
equal 2.58%
federal 2.01%
adequate 1.98%
better + n. >>共 1001
job 3.53%
chance 3.27%
way 2.46%
life 2.16%
team 1.85%
deal 1.75%
time 1.49%
condition 1.41%
place 1.40%
shape 1.35%
protection 0.64%
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