Compatibility is usually read two at a time. But the real question is often not "this person and me" — it is "this one or that one". Someone with several introductions, someone picking a business partner, someone putting a team together.
Three to five people, every pair read. Three people make three pairs, five make ten. The rules are the same ones used for two, so a pair read here and read on its own will agree.
Put a number one on the screen and people will pick that person. Saju is not a tool for choosing people. A per-person average is shown along with what it is not: one person of a different grain pulls everyone's average down, their own included.