To do this, drop areas must be shown in the chart.
1	To	to	PART	_	_	2	mark	_	_
2	do	do	VERB	INF	VerbForm=Inf	9	advcl	_	_
3	this	this	PRON	DEM-SG	Number=Sing|PronType=Dem	2	obj	_	SpaceAfter=No
4	,	,	PUNCT	Comma	_	2	punct	_	_
5	drop	drop	NOUN	SG-NOM	Number=Sing	6	compound	_	_
6	areas	area	NOUN	PL-NOM	Number=Plur	9	nsubj:pass	_	_
7	must	must	AUX	PRES-AUX	VerbForm=Fin	9	aux:pass	_	_
8	be	be	AUX	INF	VerbForm=Inf	9	aux:pass	_	_
9	shown	show	VERB	PASS	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
10	in	in	ADP	_	_	12	case	_	_
11	the	the	DET	DEF	Definite=Def|PronType=Art	12	det	_	_
12	chart	chart	NOUN	SG-NOM	Number=Sing	9	obl	_	SpaceAfter=No
13	.	.	PUNCT	Period	_	9	punct	_	_
