A substance may be considered.Logical formLearned from18 sentences. A substance may undergo an absorption.Logical formLearned from18 sentences. Air can be a substance.Logical formLearned from18 sentences. Substances may be stored.Logical formLearned from18 sentences. Sources can be constituted-of-or-filled-with toxic substances.Logical formLearned from18 sentences. A substance can be for use.Logical formLearned from18 sentences. A composition may pertain-to a substance.Logical formLearned from18 sentences. A toxicity may pertain-to a substance.Logical formLearned from18 sentences. A substance can be for a time.Logical formLearned from18 sentences. A substance may undergo tests.Logical formLearned from18 sentences. Families can be with (substance abuse problems).Logical formLearned from18 sentences. The temperature may pertain-to a substance.Logical formLearned from18 sentences. A substance can be destructive.Logical formLearned from18 sentences. Exposure can be to (chemical substances).Logical formLearned from18 sentences. Controlled substances can be illegal.Logical formLearned from18 sentences.