If you move the line upward, the distance between the moving line and the nearest parallel line below remains constant, and the perpendicular line above the moving line contracts.
1	If	if	SCONJ	_	_	3	mark	_	_
2	you	you	PRON	PERS-P2	_	3	nsubj	_	_
3	move	move	VERB	PRES	Mood=Ind|Tense=Pres|VerbForm=Fin	20	advcl	_	_
4	the	the	DET	DEF	Definite=Def|PronType=Art	5	det	_	_
5	line	line	NOUN	SG-NOM	Number=Sing	3	obj	_	_
6	upward	upward	ADV	_	_	3	advmod	_	SpaceAfter=No
7	,	,	PUNCT	Comma	_	3	punct	_	_
8	the	the	DET	DEF	Definite=Def|PronType=Art	9	det	_	_
9	distance	distance	NOUN	SG-NOM	Number=Sing	20	nsubj	_	_
10	between	between	ADP	_	_	13	case	_	_
11	the	the	DET	DEF	Definite=Def|PronType=Art	13	det	_	_
12	moving	moving	ADJ	ING	Case=Nom	13	amod	_	_
13	line	line	NOUN	SG-NOM	Number=Sing	9	nmod	_	_
14	and	and	CCONJ	_	_	18	cc	_	_
15	the	the	DET	DEF	Definite=Def|PronType=Art	18	det	_	_
16	nearest	near	ADV	SPL	Case=Nom	17	advmod	_	_
17	parallel	parallel	ADJ	POS	Degree=Pos	18	amod	_	_
18	line	line	NOUN	SG-NOM	Number=Sing	13	conj	_	_
19	below	below	ADV	_	_	18	advmod	_	_
20	remains	remain	VERB	PRES	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
21	constant	constant	ADJ	POS	Degree=Pos	20	xcomp	_	SpaceAfter=No
22	,	,	PUNCT	Comma	_	31	punct	_	_
23	and	and	CCONJ	_	_	31	cc	_	_
24	the	the	DET	DEF	Definite=Def|PronType=Art	26	det	_	_
25	perpendicular	perpendicular	ADJ	POS	Degree=Pos	26	amod	_	_
26	line	line	NOUN	SG-NOM	Number=Sing	31	nsubj	_	_
27	above	above	ADP	_	_	31	case	_	_
28	the	the	DET	DEF	Definite=Def|PronType=Art	31	det	_	_
29	moving	moving	ADJ	ING	Case=Nom	30	amod	_	_
30	line	line	NOUN	SG-NOM	Number=Sing	26	nmod	_	_
31	contracts	contract	VERB	PRES	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	20	conj	_	SpaceAfter=No
32	.	.	PUNCT	Period	_	20	punct	_	_
