A (football player) can be tough.Logical formLearned from49 sentences. A feat can be tough.Logical formLearned from49 sentences. Politics can be tough.Logical formLearned from49 sentences. A cricket can be tough.Logical formLearned from49 sentences. A tissue can be tough.Logical formLearned from48 sentences. Soldiers can be tough.Logical formLearned from48 sentences. A person can be a tough cookie.Logical formLearned from48 sentences. An uphill battle can be tough.Logical formLearned from48 sentences. Environmental standards can be tough.Logical formLearned from48 sentences. A world-city can be tough.Logical formLearned from48 sentences. A (reelection fight) can be tough.Logical formLearned from48 sentences. Months can be tough.Logical formLearned from48 sentences. Commitments can be tough.Logical formLearned from48 sentences. (Travel restrictions) can be tough.Logical formLearned from48 sentences. A condition can be tough.Logical formLearned from48 sentences.