A challenge can be fierce.Logical formLearned from334 sentences. Challenges can be unexpected.Logical formLearned from333 sentences. Challenges may pertain-to a country.Logical formLearned from333 sentences. A person may like a challenge.Logical formLearned from333 sentences. A challenge can be creative.Logical formLearned from332 sentences. A country may face challenges.Logical formLearned from329 sentences. A challenge can be by a male.Logical formLearned from327 sentences. A family may have challenges.Logical formLearned from326 sentences. A challenge can be to a law.Logical formLearned from325 sentences. A person may love a challenge.Logical formLearned from320 sentences. A challenge may pertain-to a century.Logical formLearned from319 sentences. A challenge can be from a country.Logical formLearned from317 sentences. Challenges can be great.Logical formLearned from317 sentences. Persons may have some challenges.Logical formLearned from317 sentences. Challenges may be faced.Logical formLearned from316 sentences.