Mishnayos Orlah Perek 2 Mishnah 3

והערלה את הערלה – one must state that one of them is the fourth year’s fruit of a young tree/נטע רבעי which are two designations, for it is impossible for a prohibition from one designation which would annul part of it to part of it and the Tanna/teacher calls the fourth year’s fruit of a young tree [by the designation of] Orlah, for it comes from the Orlah, and for this reason it teaches, that “Orlah [fruit] neutralizes other Orlah [fruit], and it doesn’t teach that Kilayim (mixed seeds from the field) neutralizes Kilayim, for Kilayim does not have two names like there is with Orlah.

שנפלה למאתים – not into two-hundred exactly, for if it was actually two hundred, it would not require combination, and when a Seah of Orlah fell into one-hundred and ninety-nine parts of permitted frut, they became prohibited, and when he returned and fell a Seah and a bit more of Kilaym, it combines with the one-hundred and ninety-nine to annul the Orlah, and similarly, the Orlah combines with the one-hundred and ninety-nine to annul the Seah and a bit more of mixed seeds of the vineyard/Kilei HaKerem, and this is like Rabbi Yehoshua who holds that Orlah is annulled with two-hundred and a bit more, like Terumah with one-hundred and a bit more; therefore, a Seah of Kilayim is annulled in one-hundred and ninety-nine and a bit more and the extra bit is annulled in a Seah which is missing something. And similarly, also, if there fell there a Seah and a bit more of fourth year fruit of a young tree, it combines with the one-hundred and ninety-nine parts to annul the Seah of Orlah that fell, and prohibited everything, and similarly, a Seah of Orlah combines with the one-hundred and ninety-nine parts of permitted [produce] to annul the Seah and more of the fourth year fruits that fell in at the end.