Twenty-one weeks of fighter-interceptor training.
1	Twenty	twenty	NUM	CD	NumForm=Word|NumType=Card	3	compound	3:compound	SpaceAfter=No
2	-	-	PUNCT	HYPH	_	3	punct	3:punct	SpaceAfter=No
3	one	one	NUM	CD	NumForm=Word|NumType=Card	4	nummod	4:nummod	_
4	weeks	week	NOUN	NNS	Number=Plur	0	root	0:root	_
5	of	of	ADP	IN	_	9	case	9:case	_
6	fighter	fighter	NOUN	NN	Number=Sing	8	compound	8:compound	SpaceAfter=No
7	-	-	PUNCT	HYPH	_	8	punct	8:punct	SpaceAfter=No
8	interceptor	interceptor	NOUN	NN	Number=Sing	9	compound	9:compound	_
9	training	training	NOUN	NN	Number=Sing	4	nmod	4:nmod:of	SpaceAfter=No
10	.	.	PUNCT	.	_	4	punct	4:punct	_
