A (space walk) can be arduous.Logical formLearned from5 sentences. A summer can be arduous.Logical formLearned from5 sentences. A meditation can be arduous.Logical formLearned from5 sentences. A battle may remain arduous.Logical formLearned from5 sentences. A game can be arduous.Logical formLearned from5 sentences. A mission can be arduous.Logical formLearned from4 sentences. A campaign can be arduous.Logical formLearned from4 sentences. Consultations can be arduous.Logical formLearned from4 sentences. A challenge of reducing (energy consumption) may prove arduous.Logical formLearned from4 sentences. Travels can be arduous.Logical formLearned from4 sentences. A political process can be arduous.Logical formLearned from4 sentences. Tasks may remain arduous.Logical formLearned from4 sentences. Exertions can be arduous.Logical formLearned from4 sentences. A burden can be arduous.Logical formLearned from4 sentences. A portage can be arduous.Logical formLearned from4 sentences.