A group may vow allegiance to al-qaida.Logical formLearned from4 sentences. A commander may vow a retaliation.Logical formLearned from4 sentences. A commander may vow revenge.Logical formLearned from4 sentences. A socialist government may vow an approach to violence.Logical formLearned from4 sentences. Militants may vow a campaign of bombings.Logical formLearned from4 sentences. A country may vow a measure.Logical formLearned from4 sentences. A head of an association may vow civil disobedience.Logical formLearned from4 sentences. A militant faction may vow revenge.Logical formLearned from4 sentences. A premier may vow to (weekend protesters) that something-is-the-case.Logical formLearned from4 sentences. Protesters may vow that something-is-the-case.Logical formLearned from4 sentences. A female may vow change.Logical formLearned from4 sentences. Authorities may vow (safety measures).Logical formLearned from4 sentences. Officials may vow surveillance.Logical formLearned from4 sentences. A prime minister may vow support.Logical formLearned from4 sentences. Militants may vow kidnappings of (oil workers).Logical formLearned from4 sentences.