In psychology, for example, Piaget’s stages of development are abstract concepts.
1	In	in	ADP	IN	_	2	case	2:case	Discourse=explanation-evidence:109->108:0
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3	,	,	PUNCT	,	_	2	punct	2:punct	_
4	for	for	ADP	IN	_	5	case	5:case	_
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6	,	,	PUNCT	,	_	5	punct	5:punct	_
7-8	Piaget’s	_	_	_	_	_	_	_	_
7	Piaget	Piaget	PROPN	NNP	Number=Sing	9	nmod:poss	9:nmod:poss	Entity=(156-abstract-new-cf1-3-coref(157-person-new-cf3-1-sgl-Jean_Piaget
8	’s	's	PART	POS	_	7	case	7:case	Entity=157)
9	stages	stage	NOUN	NNS	Number=Plur	14	nsubj	14:nsubj	_
10	of	of	ADP	IN	_	11	case	11:case	_
11	development	development	NOUN	NN	Number=Sing	9	nmod	9:nmod:of	Entity=(158-abstract-new-cf4-1-sgl)156)
12	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	14	cop	14:cop	_
13	abstract	abstract	ADJ	JJ	Degree=Pos	14	amod	14:amod	Entity=(156-abstract-giv:act-cf1-2-pred
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15	.	.	PUNCT	.	_	14	punct	14:punct	_
