Flag a sentry.
1	Flag	flag	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	0:root	Discourse=joint-disjunction_m:58->57:0
2	a	a	DET	DT	Definite=Ind|PronType=Art	3	det	3:det	Entity=(58-person-new-cf1-2-sgl
3	sentry	sentry	NOUN	NN	Number=Sing	1	obj	1:obj	Entity=58)|SpaceAfter=No
4	.	.	PUNCT	.	_	1	punct	1:punct	_
