An effort may be challenged.Logical formLearned from7 sentences. A book may challenge assumptions.Logical formLearned from7 sentences. Critics may be challenged.Logical formLearned from7 sentences. Results may challenge assumptions.Logical formLearned from7 sentences. Kids may be challenged.Logical formLearned from7 sentences. An idea may be challenged.Logical formLearned from7 sentences. Programs may be challenged.Logical formLearned from7 sentences. A female may challenge someone.Logical formLearned from7 sentences. Opinions may be challenged.Logical formLearned from7 sentences. Arguments may be challenged.Logical formLearned from7 sentences. A company may challenge a law.Logical formLearned from7 sentences. A program may challenge students.Logical formLearned from7 sentences. Work may challenge a person.Logical formLearned from7 sentences. Persons may challenge governments.Logical formLearned from7 sentences. Attackers may be challenged.Logical formLearned from7 sentences.