In a company of six people, everyone was asked how many acquaintances they had (the acquaintances are mutual). Response of the first five respondents: 5, 4, 3, 2, 1.
a) Graph the acquaintanceship of the six-person company.
b) How many acquaintances does the sixth person have with the company?

Members of a six-person table company: Anna, Balázs, Cili, Dezső, Egon and Fruzsina. Each of them knows exactly three other people in the company. Cili knows Dezső and Egon, and Anna doesn't know either Balázs or Dezső.

Illustrate the familiar relationships of the company with a graph! (All acquaintances are mutual.)