A network of sensors can be useless.Logical formLearned from2 sentences. Pills can be useless for prevention of gastrointestinal cancers.Logical formLearned from2 sentences. (Tax breaks) can be useless.Logical formLearned from2 sentences. A victory can be useless.Logical formLearned from2 sentences. Antibiotics can be useless against viral infections.Logical formLearned from2 sentences. Millions of filters can be useless after weeks.Logical formLearned from2 sentences. An (extradition process) can be useless.Logical formLearned from2 sentences. Producers can be useless for a majority of developing countries.Logical formLearned from2 sentences. A concession can be useless for developing countries.Logical formLearned from2 sentences. A tape of a conversation can be useless as evidence of a plot.Logical formLearned from2 sentences. Demonstrations can be useless.Logical formLearned from2 sentences. Soil can be useless for farming.Logical formLearned from2 sentences. Soils can be useless for farming.Logical formLearned from2 sentences. Bargaining can be useless.Logical formLearned from2 sentences. Methods may prove useless.Logical formLearned from2 sentences.