Persons may get lessons.Logical formLearned from9 sentences. A lesson can be appropriate.Logical formLearned from9 sentences. A lesson may be developed.Logical formLearned from9 sentences. Lessons may be ignored.Logical formLearned from9 sentences. An impact may pertain-to a lesson.Logical formLearned from9 sentences. A duration may pertain-to a lesson.Logical formLearned from9 sentences. A lesson may be introduced.Logical formLearned from9 sentences. A (lesson planning) can be effective.Logical formLearned from9 sentences. Lessons may be learnt from an experiment.Logical formLearned from9 sentences. Persons may describe lessons.Logical formLearned from9 sentences. A response can be to a lesson.Logical formLearned from9 sentences. (Classroom lessons) may pertain-to a person.Logical formLearned from9 sentences. A that can be a focus of a lesson.Logical formLearned from9 sentences. A (lesson plan) may identify a standard.Logical formLearned from9 sentences. Lessons can be from a continental-region.Logical formLearned from9 sentences.