I have a concern that the Enron optionality bug could bite us on the backside with that one.
1	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	2	nsubj	2:nsubj	_
2	have	have	VERB	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	0	root	0:root	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	4	det	4:det	_
4	concern	concern	NOUN	NN	Number=Sing	2	obj	2:obj	_
5	that	that	SCONJ	IN	_	11	mark	11:mark	_
6	the	the	DET	DT	Definite=Def|PronType=Art	9	det	9:det	_
7	Enron	Enron	PROPN	NNP	Number=Sing	9	compound	9:compound	_
8	optionality	optionality	NOUN	NN	Number=Sing	9	compound	9:compound	_
9	bug	bug	NOUN	NN	Number=Sing	11	nsubj	11:nsubj	_
10	could	could	AUX	MD	VerbForm=Fin	11	aux	11:aux	_
11	bite	bite	VERB	VB	VerbForm=Inf	4	acl	4:acl:that	_
12	us	we	PRON	PRP	Case=Acc|Number=Plur|Person=1|PronType=Prs	11	obj	11:obj	_
13	on	on	ADP	IN	_	15	case	15:case	_
14	the	the	DET	DT	Definite=Def|PronType=Art	15	det	15:det	_
15	backside	backside	NOUN	NN	Number=Sing	11	obl	11:obl:on	_
16	with	with	ADP	IN	_	18	case	18:case	_
17	that	that	DET	DT	Number=Sing|PronType=Dem	18	det	18:det	_
18	one	one	NOUN	NN	Number=Sing	11	obl	11:obl:with	SpaceAfter=No
19	.	.	PUNCT	.	_	2	punct	2:punct	_
