Missions can be arduous.Logical formLearned from8 sentences. Minutes can be arduous.Logical formLearned from8 sentences. Environments can be arduous.Logical formLearned from8 sentences. Marches can be arduous.Logical formLearned from8 sentences. A situation can be arduous.Logical formLearned from8 sentences. Rebuilding can be arduous.Logical formLearned from8 sentences. Working conditions can be arduous.Logical formLearned from8 sentences. A diplomacy can be arduous.Logical formLearned from8 sentences. A ski can be arduous.Logical formLearned from7 sentences. A (sea voyage) can be arduous.Logical formLearned from7 sentences. Negotiations can be arduous.Logical formLearned from7 sentences. Aspects can be arduous.Logical formLearned from7 sentences. A method can be arduous.Logical formLearned from7 sentences. A role can be arduous.Logical formLearned from7 sentences. A pace can be arduous.Logical formLearned from7 sentences.