The mailer's use of "Greendale School" as the return address for the letters to the Senators is also revealing.
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	2:det	_
2-3	mailer's	_	_	_	_	_	_	_	_
2	mailer	mailer	NOUN	NN	Number=Sing	4	nmod:poss	4:nmod:poss	_
3	's	's	PART	POS	_	2	case	2:case	_
4	use	use	NOUN	NN	Number=Sing	22	nsubj	22:nsubj	_
5	of	of	ADP	IN	_	8	case	8:case	_
6	"	"	PUNCT	``	_	8	punct	8:punct	SpaceAfter=No
7	Greendale	Greendale	PROPN	NNP	Number=Sing	8	compound	8:compound	_
8	School	School	PROPN	NNP	Number=Sing	4	nmod	4:nmod:of	SpaceAfter=No
9	"	"	PUNCT	''	_	8	punct	8:punct	_
10	as	as	ADP	IN	_	13	case	13:case	_
11	the	the	DET	DT	Definite=Def|PronType=Art	13	det	13:det	_
12	return	return	NOUN	NN	Number=Sing	13	compound	13:compound	_
13	address	address	NOUN	NN	Number=Sing	4	nmod	4:nmod:as	_
14	for	for	ADP	IN	_	16	case	16:case	_
15	the	the	DET	DT	Definite=Def|PronType=Art	16	det	16:det	_
16	letters	letter	NOUN	NNS	Number=Plur	13	nmod	13:nmod:for	_
17	to	to	ADP	IN	_	19	case	19:case	_
18	the	the	DET	DT	Definite=Def|PronType=Art	19	det	19:det	_
19	Senators	senator	NOUN	NNS	Number=Plur	16	nmod	16:nmod:to	_
20	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	22	cop	22:cop	_
21	also	also	ADV	RB	_	22	advmod	22:advmod	_
22	revealing	revealing	ADJ	JJ	Degree=Pos	0	root	0:root	SpaceAfter=No
23	.	.	PUNCT	.	_	22	punct	22:punct	_
