[GRASSLIST:2008] duplicate vector data

[Hayashi Shin-ichiro]

Dear GRASS Users:

I have two vector data.
I want to erase duplicate vector data which is between two vector data.

Two vector data have a lot of arc and node.

I tried that I executed v.patch between two vector data and created new vector data.
Then I executed v.rmdup on new vector data.
But It doesn't work.

My question is 
I want to erase duplicate vector data which is between two vector data.
1. Does GRASS has such a command?
2. How way is there for my purpose?

Please give me your suggestion.
Thank you in advance.
Sincerely yours.

----
Hayashi Shin-ichiro  
mail:forest at bres.tsukuba.ac.jp URL:http://ryuiki.agbi.tsukuba.ac.jp/~forest
Watershed Management Lab., University of TSUKUBA