The central idea is to first apply rules to the smallest applicable unit, then to the smallest unit containing that one, and so on. [5]
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	3:det	Bridge=61<65|Discourse=elaboration-additional:29->28:0|Entity=(65-abstract-acc:inf-cf2-3-coref
2	central	central	ADJ	JJ	Degree=Pos	3	amod	3:amod	_
3	idea	idea	NOUN	NN	Number=Sing	7	nsubj:outer	7:nsubj:outer	Entity=65)
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	cop	7:cop	_
5	to	to	PART	TO	_	7	mark	7:mark	Entity=(65-abstract-giv:act-cf2-3,11,21-disc
6	first	first	ADV	RB	Degree=Pos|NumType=Ord	7	advmod	7:advmod	_
7	apply	apply	VERB	VB	VerbForm=Inf	0	root	0:root	_
8	rules	rule	NOUN	NNS	Number=Plur	7	obj	7:obj	Entity=(66-abstract-new-cf3-1-sgl)
9	to	to	ADP	IN	_	13	case	13:case	_
10	the	the	DET	DT	Definite=Def|PronType=Art	13	det	13:det	Entity=(67-abstract-new-cf1-4-coref
11	smallest	small	ADJ	JJS	Degree=Sup	13	amod	13:amod	_
12	applicable	applicable	ADJ	JJ	Degree=Pos	13	amod	13:amod	_
13	unit	unit	NOUN	NN	Number=Sing	7	obl	7:obl:to	Entity=67)|SpaceAfter=No
14	,	,	PUNCT	,	_	15	punct	15:punct	_
15	then	then	ADV	RB	PronType=Dem	7	conj	15.1:advmod	_
15.1	apply	apply	VERB	VB	VerbForm=Inf	_	_	7:conj:and	CopyOf=7
16	to	to	ADP	IN	_	19	case	19:case	_
17	the	the	DET	DT	Definite=Def|PronType=Art	19	det	19:det	Entity=(68-abstract-new-cf4-3-sgl
18	smallest	small	ADJ	JJS	Degree=Sup	19	amod	19:amod	_
19	unit	unit	NOUN	NN	Number=Sing	15	orphan	15.1:obl:to	_
20	containing	contain	VERB	VBG	VerbForm=Ger	19	acl	19:acl	Discourse=elaboration-attribute:30->29:0
21	that	that	DET	DT	Number=Sing|PronType=Dem	22	det	22:det	Entity=(67-abstract-giv:act-cf1-2-coref
22	one	one	NOUN	NN	Number=Sing	20	obj	20:obj	Entity=67)68)|SpaceAfter=No
23	,	,	PUNCT	,	_	25	punct	25:punct	_
24	and	and	CCONJ	CC	_	25	cc	25:cc	Discourse=same-unit_m:31->29:1
25	so	so	ADV	RB	_	7	conj	7:conj:and	_
26	on	on	ADV	RB	Degree=Pos	25	advmod	25:advmod	Entity=65)|SpaceAfter=No
27	.	.	PUNCT	.	_	7	punct	7:punct	_
28	[	[	PUNCT	-LRB-	_	29	punct	29:punct	Discourse=explanation-evidence:32->29:2|SpaceAfter=No|XML=<ref>
29	5	5	NUM	CD	NumForm=Digit|NumType=Card	7	dep	7:dep	Entity=(69-abstract-new-cf5-1-sgl)|SpaceAfter=No
30	]	]	PUNCT	-RRB-	_	29	punct	29:punct	XML=</ref>
