In support of the second claim, we show that Huh? meets the criteria of a word in the sense of being a conventional lexical sign which must be learnt.
1	In	in	ADP	IN	_	2	case	2:case	Discourse=joint-other_m:42->33:2
2	support	support	NOUN	NN	Number=Sing	9	obl	9:obl:in	_
3	of	of	ADP	IN	_	6	case	6:case	_
4	the	the	DET	DT	Definite=Def|PronType=Art	6	det	6:det	Entity=(59-abstract-giv:inact-cf3-3-coref
5	second	second	ADJ	JJ	Degree=Pos|NumType=Ord	6	amod	6:amod	_
6	claim	claim	NOUN	NN	Number=Sing	2	nmod	2:nmod:of	Entity=59)|SpaceAfter=No
7	,	,	PUNCT	,	_	2	punct	2:punct	_
8	we	we	PRON	PRP	Case=Nom|Number=Plur|Person=1|PronType=Prs	9	nsubj	9:nsubj	Discourse=attribution-positive:43->44:2|Entity=(43-person-giv:act-cf1*-1-ana)
9	show	show	VERB	VBP	Mood=Ind|Number=Plur|Person=1|Tense=Pres|VerbForm=Fin	0	root	0:root	_
10	that	that	SCONJ	IN	_	13	mark	13:mark	Discourse=same-unit_m:44->42:0
11	Huh	huh	INTJ	UH	_	13	nsubj	13:nsubj	Entity=(49-abstract-giv:inact-cf2-1-coref|SpaceAfter=No|XML=<hi rend:::"italic">
12	?	?	PUNCT	.	_	11	punct	11:punct	Entity=49)|XML=</hi>
13	meets	meet	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	ccomp	9:ccomp	_
14	the	the	DET	DT	Definite=Def|PronType=Art	15	det	15:det	Entity=(73-abstract-new-cf4-2-sgl
15	criteria	criterion	NOUN	NNS	Number=Plur	13	obj	13:obj	_
16	of	of	ADP	IN	_	18	case	18:case	_
17	a	a	DET	DT	Definite=Ind|PronType=Art	18	det	18:det	Entity=(74-abstract-new-cf6-2-sgl
18	word	word	NOUN	NN	Number=Sing	15	nmod	15:nmod:of	Entity=74)73)
19	in	in	ADP	IN	_	21	case	21:case	_
20	the	the	DET	DT	Definite=Def|PronType=Art	21	det	21:det	Entity=(75-abstract-new-cf5-2-sgl
21	sense	sense	NOUN	NN	Number=Sing	15	nmod	15:nmod:in	_
22	of	of	SCONJ	IN	_	27	mark	27:mark	Discourse=elaboration-attribute:45->44:0
23	being	be	AUX	VBG	VerbForm=Ger	27	cop	27:cop	_
24	a	a	DET	DT	Definite=Ind|PronType=Art	27	det	27:det	Entity=(76-abstract-new-cf7-4-sgl
25	conventional	conventional	ADJ	JJ	Degree=Pos	27	amod	27:amod	_
26	lexical	lexical	ADJ	JJ	Degree=Pos	27	amod	27:amod	_
27	sign	sign	NOUN	NN	Number=Sing	21	acl	21:acl:of|31:nsubj:pass	_
28	which	which	PRON	WDT	PronType=Rel	31	nsubj:pass	27:ref	Discourse=evaluation-comment:46->44:1
29	must	must	AUX	MD	VerbForm=Fin	31	aux	31:aux	_
30	be	be	AUX	VB	VerbForm=Inf	31	aux:pass	31:aux:pass	_
31	learnt	learn	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	27	acl:relcl	27:acl:relcl	Entity=76)75)|SpaceAfter=No
32	.	.	PUNCT	.	_	9	punct	9:punct	_
