משנה על שבת 21:1

Terumah, terumat maaser of demai, hallah and bikkurim, are neutralized in a hundred-and-one mixture. And they are reckoned together [to form the statutory minimum]. And it is necessary to remove [from the mixture an amount equal to that of the consecrated produce contained in it]. Orlah and kilayim of the vineyard are neutralized in a two-hundred-and-one mixture. And they are reckoned together [to form the statutory minimum]. But it is not necessary to remove [from the mixture an amount equal to that of the consecrated produce contained in it]. Rabbi Shimon says: they are not reckoned together. Rabbi Eliezer says: they are reckoned together when they impart flavor, but not to prohibit.

Rabbi Eliezer says: terumah can be taken out [if it falls into] a hundred and one parts. Rabbi Joshua says: in a hundred and more, and this “more” has no definite measure. Rabbi Yose ben Meshullam says: this ‘more’ must be a kav to a hundred seahs, a sixth [of the seah] which renders the whole as medumma.