What is your rank for TOP 10 girl group in 2nd generation?

In term of accomplishment in music:

Top 3 is easy: these groups were all the biggest groups at different periods of 2nd gen:

1. Wonder Girls (top ggg in 2007-2008)
2. 2NE1 (2009-2011)
3. Sistar (2012-2015)

Top 4-6 could somehow compete with top groups or at…