Persons may challenge a system.Logical formLearned from8 sentences. A questioner may challenge a response.Logical formLearned from8 sentences. Browser may challenge a company with browser.Logical formLearned from8 sentences. Persons may challenge a female.Logical formLearned from8 sentences. A female may challenge an influence of (oil companies).Logical formLearned from8 sentences. A hypothesis may be challenged.Logical formLearned from8 sentences. A language may be challenged.Logical formLearned from8 sentences. Assertions may be challenged.Logical formLearned from8 sentences. A study of transfer may challenge ideas.Logical formLearned from8 sentences. A male may challenge a person that something-is-the-case.Logical formLearned from8 sentences. Results may challenge practice.Logical formLearned from8 sentences. A male may challenge a rival.Logical formLearned from8 sentences. Credit may be challenged.Logical formLearned from8 sentences. Persons may challenge persons with differences.Logical formLearned from8 sentences. Conventions may be challenged.Logical formLearned from8 sentences.