I havn't heard of it.
1	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	4	nsubj	4:nsubj	_
2-3	havn't	_	_	_	_	_	_	_	_
2	hav	have	AUX	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|Typo=Yes|VerbForm=Fin	4	aux	4:aux	CorrectForm=have
3	n't	not	PART	RB	_	4	advmod	4:advmod	_
4	heard	hear	VERB	VBN	Tense=Past|VerbForm=Part	0	root	0:root	_
5	of	of	ADP	IN	_	6	case	6:case	_
6	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	obl	4:obl:of	SpaceAfter=No
7	.	.	PUNCT	.	_	4	punct	4:punct	_
