An (arsenal ship) can be useless in a role.Logical formLearned from1 sentences. Walls may prove useless.Logical formLearned from1 sentences. A speculation can be useless.Logical formLearned from1 sentences. A pier can be useless.Logical formLearned from1 sentences. Helicopters can be useless.Logical formLearned from1 sentences. Assays can be useless.Logical formLearned from1 sentences. Wiring can be useless without computers.Logical formLearned from1 sentences. (Radar devices) may prove useless.Logical formLearned from1 sentences. Viral infections can be useless.Logical formLearned from1 sentences. Bureaucrats can be useless.Logical formLearned from1 sentences. Funds can be useless for an investor.Logical formLearned from1 sentences. Peacekeepings can be useless.Logical formLearned from1 sentences. A bombardment can be useless.Logical formLearned from1 sentences. A farmland can be useless.Logical formLearned from1 sentences. Grilles can be useless.Logical formLearned from1 sentences.