Investigations can be arduous.Logical formLearned from17 sentences. Tasks can be arduous.Logical formLearned from17 sentences. A climb can be arduous.Logical formLearned from17 sentences. An ascent can be arduous.Logical formLearned from17 sentences. A (peace process) can be arduous.Logical formLearned from17 sentences. A trial can be arduous.Logical formLearned from16 sentences. An incredible journey can be arduous.Logical formLearned from16 sentences. An (application process) can be arduous.Logical formLearned from16 sentences. A transfer can be arduous.Logical formLearned from16 sentences. A fight can be arduous.Logical formLearned from15 sentences. An enterprise can be arduous.Logical formLearned from15 sentences. A path can be arduous.Logical formLearned from15 sentences. A series can be arduous.Logical formLearned from14 sentences. Demands can be arduous.Logical formLearned from14 sentences. A migration can be arduous.Logical formLearned from14 sentences.