Question 90
Arnaldo, Bernaldo, Cernaldo, Dernaldo, and Ernaldo are students from different parts of Brazil selected to represent their country in international olympiads. After several weeks of training some friendships formed. Asked how many friends they had made within the group, Arnaldo, Bernaldo, Cernaldo, and Dernaldo answered $1,2,3,4$, respectively. How many group members are friends with Ernaldo?