A challenge may take place.Logical formLearned from108 sentences. A challenge may pertain-to a project.Logical formLearned from108 sentences. A challenge may be accepted.Logical formLearned from107 sentences. A challenge can be welcome.Logical formLearned from107 sentences. Challenges can be difficult.Logical formLearned from107 sentences. Challenges can be dangerous.Logical formLearned from107 sentences. Challenges may undergo an assessment.Logical formLearned from106 sentences. Persons may recognize challenges.Logical formLearned from106 sentences. A president may face challenges.Logical formLearned from106 sentences. Challenges may face a region.Logical formLearned from106 sentences. Challenges can be increased.Logical formLearned from105 sentences. A challenge can be for a title.Logical formLearned from105 sentences. A male may take a challenge.Logical formLearned from105 sentences. Challenges may be based on some film.Logical formLearned from105 sentences. A challenge can be diagnostic.Logical formLearned from105 sentences.