A letter may contain a substance.Logical formLearned from80 sentences. A substance can be corrosive.Logical formLearned from79 sentences. An information may undergo a substance.Logical formLearned from79 sentences. A dispute may undergo a substance.Logical formLearned from79 sentences. Exposure can be to substances.Logical formLearned from79 sentences. A substance can be forbidden.Logical formLearned from79 sentences. Substances can be airborne.Logical formLearned from77 sentences. Substances can be sticky.Logical formLearned from77 sentences. A substance can be rare.Logical formLearned from77 sentences. Controlled substances may undergo a manufacture.Logical formLearned from76 sentences. A substance can be genuine.Logical formLearned from76 sentences. A class can be constituted-of-or-filled-with substances.Logical formLearned from76 sentences. A political-leader may undergo a substance.Logical formLearned from76 sentences. A substance can be artificial.Logical formLearned from76 sentences. Problems can be with (substance abuse).Logical formLearned from76 sentences.