A person may sign_up to a site.Logical formLearned from28 sentences. A person may sign_up on a site.Logical formLearned from28 sentences. A person may sign_up for alerts.Logical formLearned from28 sentences. Information can be on sign_upping for a contract.Logical formLearned from28 sentences. A person may sign_up for an event.Logical formLearned from27 sentences. A person may sign_up for a package.Logical formLearned from27 sentences. Workers may sign_up for (unemployment benefits).Logical formLearned from27 sentences. Diets may sign_up for packages.Logical formLearned from26 sentences. Students may sign_up for classes.Logical formLearned from26 sentences. A female may sign_up for a program.Logical formLearned from26 sentences. A person may sign_up for lessons.Logical formLearned from26 sentences. Subjects may sign_up for an account.Logical formLearned from25 sentences. A person may sign_up for a blog.Logical formLearned from25 sentences. A website may sign_up for a newsletter.Logical formLearned from25 sentences. A person may sign_up under a person.Logical formLearned from25 sentences.