Cues can be chemical.Logical formLearned from141 sentences. Chemical weapons can be constituted-of-or-filled-with mass destruction.Logical formLearned from140 sentences. A release can be chemical.Logical formLearned from139 sentences. A make-up can be chemical.Logical formLearned from137 sentences. (Building blocks) can be chemical.Logical formLearned from131 sentences. A series can be constituted-of-or-filled-with chemical reactions.Logical formLearned from129 sentences. Facilities can be chemical.Logical formLearned from128 sentences. Phenomena can be chemical.Logical formLearned from128 sentences. A behavior can be chemical.Logical formLearned from126 sentences. A country may use chemical weapons.Logical formLearned from125 sentences. Factors can be chemical.Logical formLearned from121 sentences. A signature can be chemical.Logical formLearned from121 sentences. Threats can be chemical.Logical formLearned from120 sentences. Concentrations can be chemical.Logical formLearned from119 sentences. A chemical composition may pertain-to the atmosphere.Logical formLearned from114 sentences.