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Table 2: 
The adversarially authored questions have similar n-gram overlap to the regular test questions. However, the overlap of the named entities (ne) decreases for ir Adversarial questions.
AdversarialRegular
Unigram overlap 0.40 0.37 
Bigram overlap 0.08 0.05 
Longest n-gram overlap 6.73 6.87 
Average ne overlap 0.38 0.46 
ir Adversarial 0.35  
rnn Adversarial 0.44  
 
Total Words 107.1 133.5 
Total ne 9.1 12.5 
AdversarialRegular
Unigram overlap 0.40 0.37 
Bigram overlap 0.08 0.05 
Longest n-gram overlap 6.73 6.87 
Average ne overlap 0.38 0.46 
ir Adversarial 0.35  
rnn Adversarial 0.44  
 
Total Words 107.1 133.5 
Total ne 9.1 12.5 
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