A directory can be constituted-of-or-filled-with (search engines).Logical formLearned from23 sentences. A (search engine) can be a tool.Logical formLearned from23 sentences. An inventor may pertain-to a (steam engine).Logical formLearned from23 sentences. Engines may pertain-to a type.Logical formLearned from23 sentences. An engine can be successful.Logical formLearned from23 sentences. An (engine noise) can be loud.Logical formLearned from23 sentences. A (search engine placement) can be high.Logical formLearned from23 sentences. A (search engine) can be on a planet.Logical formLearned from23 sentences. Trade can be an engine.Logical formLearned from23 sentences. A (search engine) may pertain-to a site.Logical formLearned from23 sentences. A (jet engine) may pertain-to a company.Logical formLearned from23 sentences. Internal-combustion engines can be stationary.Logical formLearned from23 sentences. A (physics engine) may pertain-to a game.Logical formLearned from23 sentences. Dozens can be constituted-of-or-filled-with engines.Logical formLearned from23 sentences. Engines may operate.Logical formLearned from23 sentences.