Attrition may tighten ranks.Logical formLearned from11 sentences. Thighs may tighten around hips.Logical formLearned from11 sentences. Balls may tighten.Logical formLearned from11 sentences. A hand may tighten a hold.Logical formLearned from11 sentences. Regulators may tighten controls.Logical formLearned from11 sentences. Fingers may tighten around a male.Logical formLearned from11 sentences. Hands may tighten on wrists.Logical formLearned from11 sentences. Borders may be tightened.Logical formLearned from11 sentences. A hand may tighten into a fist.Logical formLearned from11 sentences. A bond may tighten.Logical formLearned from11 sentences. Races may tighten.Logical formLearned from11 sentences. (Airport security) may be tightened.Logical formLearned from11 sentences. A band may be tightened.Logical formLearned from11 sentences. A ban may be tightened.Logical formLearned from11 sentences. Security may be tightened at some airports.Logical formLearned from11 sentences.