A tunnel may be opened.Logical formLearned from181 sentences. A tunnel can be secure.Logical formLearned from181 sentences. Some light can be at an end of a tunnel.Logical formLearned from179 sentences. A tunnel may pertain-to a river.Logical formLearned from175 sentences. A tunnel may collapse.Logical formLearned from172 sentences. A tunnel can be in a world-city.Logical formLearned from171 sentences. A tunnel may pertain-to players.Logical formLearned from171 sentences. An entrance can be to a tunnel.Logical formLearned from168 sentences. A tunnel may be closed.Logical formLearned from167 sentences. Hundreds can be constituted-of-or-filled-with tunnels.Logical formLearned from163 sentences. A tunnel may undergo a closure.Logical formLearned from161 sentences. A section may pertain-to a tunnel.Logical formLearned from158 sentences. A tunnel may be built.Logical formLearned from158 sentences. A tunnel may collapse.Logical formLearned from157 sentences. A system can be constituted-of-or-filled-with tunnels.Logical formLearned from157 sentences.