Recite a 12 Rak-a’t Salah over 3 nights in sets of 2 as under: "On the Night of the 13th recite 2 Rak-a’t, On the Night of 14th recite 4 Rak-a’t, and On the Night of 15th recite 6 Rak-a’t: In each Rak-a’t recite Surah Fatih’ah, Surah Yasin, Surah Mulk and Sura Ikhlaas.