A person may sign_up for an article.Logical formLearned from13 sentences. A person may sign_up for (article numbers).Logical formLearned from13 sentences. Users may sign_up for an account.Logical formLearned from13 sentences. An (email address) may sign_up for a happy news.Logical formLearned from13 sentences. A male may sign_up audiobook.Logical formLearned from13 sentences. A male may sign_up for a military.Logical formLearned from13 sentences. Persons may sign_up for classes.Logical formLearned from13 sentences. Some persons may sign_up for a service.Logical formLearned from13 sentences. Some students may sign_up for a class.Logical formLearned from13 sentences. A person may sign_up for an exam.Logical formLearned from13 sentences. A country may sign_up to a convention.Logical formLearned from13 sentences. Persons may sign_up for (unemployment insurance).Logical formLearned from13 sentences. A male may sign_up for lessons.Logical formLearned from12 sentences. Students may sign_up for a course.Logical formLearned from12 sentences. Players may sign_up for an (account creation).Logical formLearned from12 sentences.