http://mbtivietnam.net/diendan/index.php?threads/nh%E1%BA%ADn-ra-t%C3%ADnh-c%C3%A1ch-kh%C3%B4ng-qua-test.21/ You can see on the second comment. I just realised if I removed http:// of the link, I can edit the post.
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Sometimes I try to edit and post, it got problem above. I'm not sure quite since others still normal.
If edit can't, I still can...