A flight can be arduous.Logical formLearned from21 sentences. A transition can be arduous.Logical formLearned from21 sentences. A struggle can be arduous.Logical formLearned from20 sentences. A procedure can be arduous.Logical formLearned from20 sentences. A project can be arduous.Logical formLearned from19 sentences. Times can be arduous.Logical formLearned from19 sentences. A practice can be arduous.Logical formLearned from19 sentences. A program can be arduous.Logical formLearned from19 sentences. A shoot can be arduous.Logical formLearned from18 sentences. Problems can be arduous.Logical formLearned from18 sentences. An operation can be arduous.Logical formLearned from18 sentences. A period can be arduous.Logical formLearned from17 sentences. Battles can be arduous.Logical formLearned from17 sentences. A war can be arduous.Logical formLearned from17 sentences. A panic can be arduous.Logical formLearned from17 sentences.