A second stage may pertain-to a drill.Logical formLearned from4 sentences. Persons may conduct a drill.Logical formLearned from4 sentences. A (mass drill) can be annual.Logical formLearned from4 sentences. A (drill base) may pertain-to a country.Logical formLearned from4 sentences. Drills can be real.Logical formLearned from4 sentences. A submarine may perform a drill.Logical formLearned from4 sentences. Part can be in military drills.Logical formLearned from4 sentences. An end may pertain-to drills.Logical formLearned from4 sentences. A drill may be involved.Logical formLearned from4 sentences. A drill may last.Logical formLearned from4 sentences. Tens of thousands of troops may begin a military drill.Logical formLearned from4 sentences. A (fire drill) can be planned.Logical formLearned from4 sentences. A portion may pertain-to a (drill pipe).Logical formLearned from4 sentences. A drill can be interstate.Logical formLearned from4 sentences. A (fire drill) can be unplanned.Logical formLearned from4 sentences.