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Create a true Python list to ensure that you only query the database once to generate the public key of the election, without the need for further queries.

I would like to register the other members who helped to identify this issue:
 - Thiago Alexandre Herek - UTFPR / Brazil
 - José Gonçalves De Oliveira Júnior - UTFPR / Brazil
 - Joilson Alves Júnior - UTFPR / Brazil
 - Paulo Matias - UFSCar / Brazil (@thotypous)