A chunk can be worthless.Logical formLearned from5 sentences. (Toxicology tests) can be worthless.Logical formLearned from5 sentences. Goods can be worthless.Logical formLearned from5 sentences. Rubles can be worthless.Logical formLearned from5 sentences. A society can be worthless.Logical formLearned from5 sentences. A pact can be worthless.Logical formLearned from5 sentences. A pension can be worthless.Logical formLearned from5 sentences. (Power prices) may prove worthless.Logical formLearned from5 sentences. A ceasefire can be worthless.Logical formLearned from5 sentences. A drug can be worthless.Logical formLearned from4 sentences. Earnings can be worthless.Logical formLearned from4 sentences. A horse can be worthless.Logical formLearned from4 sentences. A metal can be worthless.Logical formLearned from4 sentences. A picture can be worthless.Logical formLearned from4 sentences. Targets can be worthless.Logical formLearned from4 sentences.