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Enumerate lines until each line break using awk

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# 1  
Old 07-09-2014
Enumerate lines until each line break using awk
Hi,
I have the following data:

Code:
This	this	DT	0.99955	0	4
is	be	VBZ	1	5	7
sentence	sentence	NN	0.916667	8	16
one	one	NN	0.545078	17	20
.	.	Fp	1	20	21

This	this	DT	0.99955	22	26
is	be	VBZ	1	27	29
the	the	DT	1	30	33
second	2	JJ	0.930556	34	40
sentence	sentence	NN	0.916667	41	49
.	.	Fp	1	49	50

Hi	hello	UH	1	51	53
everyone	everyone	NN	1	54	62
!	!	Fat	1	62	63

I want to enumerate the lines in each data until the white break line, and then begin the enumeration again. Thus, the final result would look like this:

Code:
0   This	this	DT	0.99955	0	4
1   is	be	VBZ	1	5	7
2   sentence	sentence	NN	0.916667	8	16
3   one	one	NN	0.545078	17	20
4   .	.	Fp	1	20	21

0   This	this	DT	0.99955	22	26
1   is	be	VBZ	1	27	29
2   the	the	DT	1	30	33
3   second	2	JJ	0.930556	34	40
4   sentence	sentence	NN	0.916667	41	49
5   .	.	Fp	1	49	50

0   Hi	hello	UH	1	51	53
1   everyone	everyone	NN	1	54	62
2   !	!	Fat	1	62	63

Is this possible to do with
Code:
awk

?
If not, can anyone suggestion a solution in which I can arrive at the final result?

In advance, thank you!
# 2  
Old 07-09-2014
Code:
awk 'NF{$0=c++ FS $0}!NF{c=0}1' file

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