A routine can be arduous.Logical formLearned from4 sentences. An art can be arduous.Logical formLearned from4 sentences. Lives can be arduous.Logical formLearned from4 sentences. Recovery can be arduous.Logical formLearned from4 sentences. Travel can be arduous.Logical formLearned from4 sentences. A (time consuming) can be arduous.Logical formLearned from4 sentences. Conditions can be arduous.Logical formLearned from4 sentences. An (amendment process) can be arduous.Logical formLearned from4 sentences. A succession can be arduous.Logical formLearned from4 sentences. Talks can be arduous.Logical formLearned from4 sentences. Progress can be arduous.Logical formLearned from4 sentences. An excavation can be arduous.Logical formLearned from4 sentences. A trek can be arduous.Logical formLearned from4 sentences. A war can be arduous for a country.Logical formLearned from4 sentences. A fortnight can be arduous.Logical formLearned from4 sentences.