# 1. export bookmarks
# 2. awk -f cbdd.awk bookmarks_12_4_16.html > uniq.html
# 3. import uniq.html

BEGIN { FS = " " }

$2 ~ /^HREF/ {
    if (!($2 in seen)) {
        seen[$2]
        print $0
    }
    next
}

{
    print $0
}