31.   Police did not name the victims or explain the motive for the attack.

v. + motive >>共 168
have 20.24%
give 8.01%
establish 6.87%
question 6.80%
determine 6.58%
know 6.15%
investigate 3.29%
offer 3.29%
explain 2.22%
see 2.07%
explain + n. >>共 1380
decision 3.64%
reason 3.51%
difference 2.29%
action 2.25%
situation 1.97%
position 1.75%
discrepancy 1.29%
problem 1.25%
thing 1.14%
phenomenon 1.02%
motive 0.52%
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