[GRASSLIST:5150] Extraction from vector areas

I use GRASS5.3.
There are 100 areas in the vector map but only filled
with just 5 varities.
example: a,b,c,d,e

I wish to extract a vector composed of only 'a'.
in
v.extract -d

I have to make a file and give it.. this is lot of
extra work.

Is there a simple way for this.

Ravi Kumar

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