4. Discussion.
1	4.	4.	X	LS	_	2	dep	2:dep	Discourse=organization-heading:1->20:4
2	Discussion	discussion	NOUN	NN	Number=Sing	0	root	0:root	Entity=(1-abstract-new-cf1-1-sgl)|SpaceAfter=No
3	.	.	PUNCT	.	_	2	punct	2:punct	_
