If a houseowner was a partner with neighbors, with this one in wine and with that one in wine, they need not make an eruv; with this one in wine and with that one in oil, they must make an eruv. R’ Shimon says: In either case they need not make an eruv.

If five groups spent the Sabbath in one mansion — Beis Shammai say: An eruv for each group. But Beis Hillel say: One eruv for all of them. They agree, however, that when some of them are quartered in rooms or upper stories, they need an eruv for each group.

Brothers or partners who eat at their father’s table, but who sleep in their own homes, need an eruv for each one. Therefore, if one of them forgot to contribute to the eruv, he must nullify his rights. When is this so? When they bring their eruv to another place; but if the eruv was brought to them, or there are no other residents in the courtyard, they need not contribute to the eruv.

Five courtyards which open one into the other and into an alley — if they made an eruv in the courtyards but did not make a shituf in the alley, they are permitted in the courtyards but prohibited in the alley; if they did make a shituf in the alley, they are permitted here and there. If they made an eruv for the courtyards and a shituf for the alley, but one of the residents of the courtyard forgot to contribute to the eruv, they are permitted here and there; if one of the residents of the alley did not participate in the shituf, they are permitted in the courtyards, but are prohibited in the alley; for an alley is to the courtyards as a courtyard is to the houses.