Five components of an olah combine with one another: the meat, the cheilev, the flour, the wine, and the oil. Six [components] of a todah [combine with one another]: the meat, the cheilev, the flour, the wine, the oil, and the loaves. Terumah, terumas maaser, terumas maaser of demai, challah, and bikkurim, combine with one another to prohibit, and to make one liable on their account for the [surcharge of] one-fifth.

All piggul [foods] combine with one another. All nossar [foods] combine with one another. All neveilos combine with one another. All shera- tzim combine with one another. The blood of a sheretz and its meat combine with each other.  R’ Yehoshua stated a general rule: All [items] whose tumah [transmission] and [minimum] measure are the same, combine with one another. [If] their tumah [transmission is the same] but not their [minimum] measure, [or if] their [minimum] measure [is the same] but not their tumah [transmission], [or if] neither their tumah [transmission] nor their [minimum] measure [are the same], they do not combine with one another.