# text = This is a sentence with invalid heads.
1	This	_	_	_	_	9	dep	_	_
2	is	_	_	_	_	0	root	_	_
3	a	_	_	_	_	4	dep	_	_
4	sentence	_	_	_	_	2	dep	_	_
5	with	_	_	_	_	4	dep	_	_
6	invalid	_	_	_	_	7	dep	_	_
7	heads	_	_	_	_	5	dep	_	_
8	.	_	_	_	_	9	dep	_	_
