Three people who ate together are obligated [to say] the blessing collectively. [If] one ate [bread] of demai, or [of] first tithe whose terumah has been taken, or [of] second tithe or consecrated produce that were redeemed, or [if] an attendant who ate an olive’s volume, or a Cuthean — the collective blessing is recited on their account. But if one ate tevel, or first tithe whose terumah had not been taken, or [of] second tithe or consecrated pro-duce that was not redeemed, or [if] an attendant ate less than an olive’s volume, or a gentile — the collective blessing is not recited on their account.