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1. There is a dispute about whether three blasts of the Shofar are sounded on the Mizbe'ach or on the tenth step.
2. The Gemara explains the nature of the dispute (#1).
3. The Gemara explains why on Shabbos Sukos there are only 48 blasts, and not 51.
4. When Yom Kippur would fall on Erev Shabbos, they would not sound the three blasts before Shabbos.
5. When Rosh Chodesh is on Shabbos, the song of Rosh Chodesh overrides the song of Shabbos.
A BIT MORE
1. The Mishnah follows the view of Rebbi Eliezer ben Yakov who says that these blasts are sounded on the Mizbe'ach. The Tosefta says that they are sounded on the tenth step.
2. The Mishnah understands that there is no purpose to sounding blasts on the tenth step, as blasts were already sounded at the opening of the gates. The Tosefta understands that there is no purpose to sounding blasts on the Mizbe'ach, as blasts are sounded for the water libation that is going to be done on the Mizbe'ach.
3. The Gemara's question is that there should be three extra blasts because of the Korban Musaf of Shabbos. Rava says that since the water libations are not performed on Shabbos, the three blasts which accompany the water libations are not done. Hence, there are still only 48 blasts and not 51.
4. Similarly, if Yom Kippur would fall on Motza'i Shabbos, they would not make Havdalah.
5. There is a dispute about whether this means merely that the song of Rosh Hashanah is said before the song of Shabbos, or it means that the song of Rosh Hashanah overrides the song of Shabbos completely in order to publicize that it is Rosh Chodesh.
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