A trade can be necessary.Logical formLearned from12 sentences. An (art experience) can be necessary.Logical formLearned from12 sentences. Some characteristics can be necessary.Logical formLearned from12 sentences. (Stopping distances) can be necessary for speeds.Logical formLearned from12 sentences. A US-city can be necessary.Logical formLearned from12 sentences. Encryption can be necessary.Logical formLearned from12 sentences. Some preparation can be necessary.Logical formLearned from12 sentences. A remedial action can be necessary.Logical formLearned from12 sentences. A necessary condition may pertain-to an existence.Logical formLearned from12 sentences. A course of action can be necessary.Logical formLearned from12 sentences. An anesthetic can be necessary.Logical formLearned from12 sentences. A necessary condition can be for (poverty reduction).Logical formLearned from12 sentences. A rescue can be necessary.Logical formLearned from12 sentences. An audition can be necessary.Logical formLearned from12 sentences. Judges can be necessary.Logical formLearned from12 sentences.