(Border controls) may be tightened.Logical formLearned from21 sentences. Supply may tighten.Logical formLearned from20 sentences. A back may tighten.Logical formLearned from20 sentences. An embargo may be tightened.Logical formLearned from20 sentences. A hand may tighten a grip.Logical formLearned from20 sentences. Everyone may tighten belts.Logical formLearned from20 sentences. Fingers may tighten on a shoulder.Logical formLearned from20 sentences. A competition may tighten.Logical formLearned from20 sentences. Businesses may tighten belts.Logical formLearned from20 sentences. A bolt may be tightened.Logical formLearned from20 sentences. A government may tighten credit.Logical formLearned from20 sentences. A hamstring may tighten.Logical formLearned from20 sentences. A world-city may tighten controls.Logical formLearned from20 sentences. A bill may tighten an embargo.Logical formLearned from19 sentences. Regulations may tighten.Logical formLearned from19 sentences.