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Table 4:

Average number of words per question and answer, and average longest n-gram overlap between passage and question.

	$D_{SQuAD}$	$D_{BiDAF}$	$D_{BERT}$	$D_{RoBERTa}$
Question length	10.3	9.8	9.8	10.0
Answer length	2.6	2.9	3.0	3.2
N-Gram overlap	3.0	2.2	2.1	2.0

	$D_{SQuAD}$	$D_{BiDAF}$	$D_{BERT}$	$D_{RoBERTa}$
Question length	10.3	9.8	9.8	10.0
Answer length	2.6	2.9	3.0	3.2
N-Gram overlap	3.0	2.2	2.1	2.0