[GRASS5] dumb question

It seems odd I never had to do this before, but how do you
edit a vector file to remove small areas? I want to delete
all areas smaller than 80,000 sq meters.

And a related question, I have a contour file generated by
r.contour on a single category from a landcover map. But the
lines are all type line rather than type area. I know I can
use v.digit to go in and change each of them to area, but is
there a program to change all "lines" to "areas"?

Thanks,

Bill

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