A male may issue a challenge.Logical formLearned from102 sentences. Persons may be faced with challenges.Logical formLearned from102 sentences. A challenge can be persistent.Logical formLearned from101 sentences. A challenge may pertain-to a high-court.Logical formLearned from101 sentences. A challenge can be twofold.Logical formLearned from101 sentences. A challenge can be for spouses.Logical formLearned from101 sentences. A challenge can be for a company.Logical formLearned from101 sentences. A (title challenge) may pertain-to a male.Logical formLearned from100 sentences. A challenge can be to a US-president.Logical formLearned from100 sentences. Challenges may be quizzed on knowledge.Logical formLearned from100 sentences. A challenge may pertain-to the world.Logical formLearned from100 sentences. A challenge can be to a ban.Logical formLearned from100 sentences. Challenges can be in a region.Logical formLearned from100 sentences. A challenge can be related.Logical formLearned from100 sentences. A challenge can be to a sovereignty.Logical formLearned from100 sentences.