Measures may tighten control.Logical formLearned from6 sentences. A deadlock may tighten in a (power struggle).Logical formLearned from6 sentences. A move may tighten a grip on (world oil supply).Logical formLearned from6 sentences. A central bank may tighten conditions.Logical formLearned from6 sentences. Countries may tighten security.Logical formLearned from6 sentences. A (bird flu virus) may tighten a grip on a continent.Logical formLearned from6 sentences. Parties may tighten a grip on a parliament.Logical formLearned from6 sentences. Barons may tighten a grip on medias.Logical formLearned from6 sentences. Forces may tighten a noose on supporters of iraqi president.Logical formLearned from6 sentences. Authorities may tighten controls.Logical formLearned from6 sentences. Rebels may tighten a noose.Logical formLearned from6 sentences. (Security forces) may tighten a grip on a world-city.Logical formLearned from6 sentences. Cities may tighten belts.Logical formLearned from6 sentences. Police may tighten (security checks).Logical formLearned from6 sentences. An Israeli army may tighten a closure of borders.Logical formLearned from6 sentences.