Related for Berakhot 92:10

What is the order of [the beds in the room used for] reclining [during eating]? At the time when there are [only] two beds, the [most] senior [person]4 reclines on top of the first [bed] and the second one to him [in seniority reclines] below him (i.e. his head is at the first person’s feet). And at the time when there are three beds, the [most] senior [person] reclines on top of the middle [bed], the second one to him [in seniority reclines] above him, [and] the third one to him [in seniority] reclines below him. [If there are more than three people, then] they get ordered in this way (i.e. in groups of three) and on.