Yes, because with Grass, a single line can be used for 2 areas,one >on each side.
Once you change the 'L' to 'A' in your ascii vector file,
run v.in.ascii to made a binary vector file and then run
v.support, which will compute the topology, hence creatingyour areas >().
You will then need to give each area a label with v.digit,
unless you have a site file giving you a point location
(with the number you will use for polygon attribute) inside
each area to be labelled, in which case you can create a
dig_att file before running v.support.
Labelizing all the areas doesn't help. It seems to me that it doesn't works because v.support's algorithm is not able to recognize the polygons contained in the map.
Juan
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