When something is unprecedented, it means it doesn’t have a past, doesn’t have a history.
1	When	when	ADV	WRB	PronType=Int	4	advmod	4:advmod	Discourse=context-circumstance:81->82:1|Entity=(89-event-new-cf1-4-disc
2	something	something	NOUN	NN	Number=Sing	4	nsubj	4:nsubj	Entity=(90-abstract-new-cf2-1-coref)
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	4:cop	_
4	unprecedented	unprecedented	ADJ	JJ	Degree=Pos|Polarity=Neg	7	advcl	7:advcl:when	Entity=89)|SpaceAfter=No
5	,	,	PUNCT	,	_	4	punct	4:punct	_
6	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	7	nsubj	7:nsubj	Discourse=elaboration-additional:82->80:1|Entity=(89-event-giv:act-cf1-1-coref)
7	means	mean	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	0:root	_
8	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	11	nsubj	11:nsubj|17:nsubj	Entity=(90-abstract-giv:act-cf2-1-ana)
9-10	doesn’t	_	_	_	_	_	_	_	_
9	does	do	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	11	aux	11:aux	_
10	n’t	not	PART	RB	Polarity=Neg	11	advmod	11:advmod	_
11	have	have	VERB	VB	VerbForm=Inf	7	ccomp	7:ccomp	_
12	a	a	DET	DT	Definite=Ind|PronType=Art	13	det	13:det	Entity=(91-abstract-new-cf3-2-coref
13	past	past	NOUN	NN	Number=Sing	11	obj	11:obj	Entity=91)|SpaceAfter=No
14	,	,	PUNCT	,	_	17	punct	17:punct	_
15-16	doesn’t	_	_	_	_	_	_	_	_
15	does	do	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	17	aux	17:aux	Discourse=joint-list_m:83->82:0
16	n’t	not	PART	RB	Polarity=Neg	17	advmod	17:advmod	_
17	have	have	VERB	VB	VerbForm=Inf	11	conj	7:ccomp|11:conj	_
18	a	a	DET	DT	Definite=Ind|PronType=Art	19	det	19:det	Entity=(92-abstract-new-cf4-2-sgl
19	history	history	NOUN	NN	Number=Sing	17	obj	17:obj	Entity=92)|SpaceAfter=No
20	.	.	PUNCT	.	_	7	punct	7:punct	_
