Bava Batra 102B

רב שישא בריה דרב אידי אמר: לעולם רבי שמעון היא, והכא במאי עסקינן ⁠– בניפלי.

Rav Sheisha, son of Rav Idi, said: Actually, the Mishnah is in accordance with the opinion of R' Shimon, and here we are dealing with a case where the corpses found were of non-viable newborns buried in a smaller chamber only 6 cubits long. Adding a courtyard of 6 cubits and another regular-sized chamber of 8 cubits yields a total length of the catacomb of 20 cubits.

ומדהא בניפלי ⁠– הא נמי בניפלי; תמני סרי הויין! חדא בניפלי אמרינן, תרתי בניפלי לא אמרינן.

The Talmud asks: But since this is dealing with a chamber that was created for burying non-viable newborns, there too, with regard to that chamber, on the other side of the courtyard, we are dealing with a chamber created for non-viable newborns as well. Therefore, the total length of the catacomb would be 18 cubits. The Talmud answers: We say that perhaps one of the chambers is for non-viable newborns, but we do not say that two chambers might have been constructed for non-viable newborns.

ורמי דרבנן אדרבנן, ורמי דרבי שמעון אדרבי שמעון –

§ Above, the Talmud cited a baraita that relates a dispute between R' Shimon and the Rabbis with regard to 3 corpses buried close together. The Rabbis hold that this is not considered a graveyard, whereas R' Shimon maintains that it can be. And the Talmud raises a contradiction from another ruling of the Rabbis against this ruling of the Rabbis, and it also raises a contradiction from another ruling of R' Shimon against this ruling of R' Shimon.

דתניא: כרם הנטוע על פחות מארבע אמות ⁠– רבי שמעון אומר: אינו כרם. וחכמים אומרים: הרי זה כרם, ורואין את האמצעים כאילו אינן.

As it is taught in a Mishnah (Kilayim 5:2): With regard to a vineyard that is planted on an area where there is less than 4 cubits of open space between the vines, R' Shimon says: It is not considered to be a vineyard with regard to the prohibition of diverse kinds and other halakhot, as it is overcrowded. And the Rabbis say: This is considered to be a vineyard, and the reason for this is that the middle vines are viewed as if they are not there, and the outer vines meet the requirements for a vineyard. Therefore, it is prohibited to plant other crops anywhere in that area.