Some (security guards) may be injured.Logical formLearned from80 sentences. Security can be essential.Logical formLearned from80 sentences. Problems can be with security.Logical formLearned from80 sentences. A challenge can be to a security.Logical formLearned from80 sentences. Security may undergo a discussion.Logical formLearned from80 sentences. Protesters may clash with (security forces).Logical formLearned from80 sentences. A time can be constituted-of-or-filled-with security.Logical formLearned from80 sentences. Experience can be in national security.Logical formLearned from80 sentences. A security can be solid.Logical formLearned from80 sentences. (Security requirements) can be stringent.Logical formLearned from80 sentences. Securities may pertain-to issuers.Logical formLearned from80 sentences. Securities can be for sale.Logical formLearned from80 sentences. Security can be in a world.Logical formLearned from80 sentences. An attack can be on (security forces).Logical formLearned from80 sentences. Thousands can be constituted-of-or-filled-with (security officers).Logical formLearned from80 sentences.