## Task 1 - 170721

Anja invited her two friends Cathrin and Eva to her birthday party, neither of whom is related to her. Additionally, the boys Bernd, Dirk, Frank, and Gerold were invited, each being a brother of one of the three girls.

After these seven people sat down at a round table in alphabetical order of their first names, it was noticed:

(1) None of the boys sat next to their sister.

(2) Frank and Gerold are twins.

Determine whether the names of the brothers of each of the three girls can be identified from the above statements; if so, provide these names!
Bernd sat next to Anja and Cathrin. Therefore, he can only be Eva's brother due to (1).

Dirk sat between Cathrin and Eva, so he can also only be Anja's brother due to (1).

Due to (1) and (2), Frank and Gerold cannot be Anja's or Eva's brothers. Thus, they are Cathrin's brothers.