This article “Periya Pirattiyarin Amsamngal Pengal” written by Smt. Rajalakshmi Madhava Iyengar which explains in detail, how the women are the amsam of Piratti. Part 1 of this article can be read from: http://anudinam.org/2013/07/18/periya-pirattiyarin-amsangal-pengal-part-1/
very nice to get refreshed with these basic epics