Rules may be challenged.Logical formLearned from7 sentences. Voters may be challenged.Logical formLearned from7 sentences. A person may challenge a person to a race.Logical formLearned from7 sentences. A person may challenge a contention.Logical formLearned from7 sentences. A woman may be challenged.Logical formLearned from7 sentences. Research may challenge an idea.Logical formLearned from7 sentences. A campaign may be challenged.Logical formLearned from7 sentences. A conduct may be challenged.Logical formLearned from7 sentences. Persons may challenge assumptions.Logical formLearned from7 sentences. A book may challenge a notion.Logical formLearned from7 sentences. Others may challenge a person.Logical formLearned from7 sentences. Persons may challenge enemies of reform.Logical formLearned from7 sentences. A female may challenge a (court ruling).Logical formLearned from7 sentences. An (image icon) may challenge community.Logical formLearned from7 sentences. A US-president may challenge (party dogma).Logical formLearned from7 sentences.