How many confirmed Sunnahs are there for the obligatory prayers that were reported from the Prophet, may Allah bless him and grant him peace, in the authentic hadiths?

The confirmed Sunnah prayers are: Witr (due to the Hadith: "Perform Witr, O people of the Qur'an"), the two Rak'ahs of Fajr (due to the Hadith: "Do not abandon them, even if horses were to chase you"), two Rak'ahs before Dhuhr, two Rak'ahs after Dhuhr, two Rak'ahs after Maghrib, and two Rak'ahs after Isha (due to the Hadith of Ibn Umar, in which he mentioned his preservation of ten Rak'ahs). It has been reported that "whoever prays twelve Rak'ahs in a day and night, a house will be built for him in Paradise."