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1. The Tosefta explains that one can see if a person is learned from the way he expresses his blessings.
2. Even fetuses sang at the parting of Yam Suf.
3. A Zimun is not always allowed to be split up.
4. Two groups may be considered one group for the purposes of Zimun.
5. There are laws regarding how we treat bread.
A BIT MORE
1. For example, if one says, "uvi'Tuvo [Chayeinu]," when he leads the Zimun, he clearly is learned, as he is praising Hashem for sustaining us with "all of His good" that He bestows upon us. If he says, "umi'Tuvo," that is a sign that is not learned, because he is praising Hashem only for the small amount of good that he has enjoyed, which is a far smaller form of praise.
2. This is derived from the verse, "In gathering they blessed Elokim, Hashem from the source (i.e. referring to the womb) of Yisrael."
3. If a person eats with six or more people, they may divide into two groups (or three if there are nine people) to do make a Zimun, as the praise said by each group is the same. However, if there are ten, they may not divide into smaller groups, since each group has fewer than ten people and such group says a lesser form of praise to Hashem.
4. If even some of one group can see some of the other group, they may combine for a Zimun (assuming that they are eating together, such as at a wedding or banquet). If they cannot see each other at all, even if they are eating at the same event for the same purpose, they do not combine.
5. One may not place raw meat on bread, pass a full cup of liquid over it, throw it, or lean a bowl on it.
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