An undertaking can be arduous.Logical formLearned from64 sentences. A route can be arduous.Logical formLearned from59 sentences. Work can be arduous.Logical formLearned from58 sentences. A journey can be arduous.Logical formLearned from57 sentences. Hours can be arduous.Logical formLearned from56 sentences. A tour can be arduous.Logical formLearned from55 sentences. A duty can be arduous.Logical formLearned from54 sentences. A season can be arduous.Logical formLearned from54 sentences. A course can be arduous.Logical formLearned from54 sentences. Days can be arduous.Logical formLearned from53 sentences. A nature can be arduous.Logical formLearned from51 sentences. A schedule can be arduous.Logical formLearned from51 sentences. A part can be arduous.Logical formLearned from42 sentences. A quest can be arduous.Logical formLearned from39 sentences. A service can be arduous.Logical formLearned from38 sentences.