Then, just as suddenly as the thought had appeared, it vanished.
1	Then	then	ADV	_	PronType=Dem	13	advmod	_	SpaceAfter=No
2	,	,	PUNCT	Comma	_	1	punct	_	_
3	just	just	ADV	_	_	4	advmod	_	_
4	as	as	ADV	_	_	5	advmod	_	_
5	suddenly	sudden	ADV	_	_	13	advmod	_	_
6	as	as	SCONJ	_	_	7	mark	_	_
7	the	the	DET	DEF	Definite=Def|PronType=Art	8	det	_	_
8	thought	think	NOUN	SG-NOM	Number=Sing	10	nsubj	_	_
9	had	have	AUX	PAST	Mood=Ind|Tense=Past|VerbForm=Fin	10	aux	_	_
10	appeared	appear	VERB	PERF	Mood=Ind|Tense=Past|VerbForm=Fin	5	acl	_	SpaceAfter=No
11	,	,	PUNCT	Comma	_	5	punct	_	_
12	it	it	PRON	PERS-SG	_	13	nsubj	_	_
13	vanished	vanish	VERB	PAST	Mood=Ind|Tense=Past|VerbForm=Fin	0	root	_	SpaceAfter=No
14	.	.	PUNCT	Period	_	13	punct	_	_
