Systems can be practical.Logical formLearned from321 sentences. An activity can be practical.Logical formLearned from320 sentences. A meaning can be practical.Logical formLearned from318 sentences. A component can be practical.Logical formLearned from315 sentences. An impossibility can be practical.Logical formLearned from312 sentences. A difficulty can be practical.Logical formLearned from310 sentences. Obstacles can be practical.Logical formLearned from310 sentences. An expression can be practical.Logical formLearned from307 sentences. A design can be practical.Logical formLearned from302 sentences. Alternatives can be practical.Logical formLearned from300 sentences. An advantage can be practical.Logical formLearned from297 sentences. A basis can be practical.Logical formLearned from296 sentences. A possibility can be practical.Logical formLearned from296 sentences. Demonstrations can be practical.Logical formLearned from291 sentences. Decisions can be practical.Logical formLearned from290 sentences.