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Social media is becoming increasingly popular. In June 2018, Instagram surpassed one billion active users, and nearly one in ten is a bot [1, 2]. A bot is a piece of software that automatically performs tasks over the internet [3]. Since bots are one of the main causes of fake engagement, spreading unverified information and political propaganda, and they are getting more complicated every day, social networks use automated systems to detect them [1]–[5]. But these automated systems are not without cost. Previous studies have