A quack can be useless.Logical formLearned from3 sentences. A cable can be useless.Logical formLearned from3 sentences. A (conference call) can be useless.Logical formLearned from3 sentences. A hard work may be rendered useless.Logical formLearned from3 sentences. Directions can be useless.Logical formLearned from3 sentences. Some pages can be useless.Logical formLearned from3 sentences. Pics can be useless.Logical formLearned from3 sentences. A dinosaur can be useless.Logical formLearned from3 sentences. Fact can be useless.Logical formLearned from3 sentences. An offensive can be useless.Logical formLearned from3 sentences. A match can be useless.Logical formLearned from3 sentences. A (police force) can be useless.Logical formLearned from3 sentences. A circle can be useless.Logical formLearned from3 sentences. A viewfinder can be useless.Logical formLearned from3 sentences. A creation can be useless.Logical formLearned from3 sentences.