A source can be constituted-of-or-filled-with discussion.Logical formLearned from117 sentences. A source may tell a magazine.Logical formLearned from117 sentences. A source can be for (homeland security news).Logical formLearned from117 sentences. A source can be economical.Logical formLearned from117 sentences. A source may pertain-to an epidemic.Logical formLearned from117 sentences. Sources can be constituted-of-or-filled-with pollutants.Logical formLearned from117 sentences. A source can be close to a president.Logical formLearned from117 sentences. Water can be from sources.Logical formLearned from116 sentences. A source may pertain-to a document.Logical formLearned from116 sentences. A source can be constituted-of-or-filled-with natural gas.Logical formLearned from116 sentences. An identity may pertain-to a source.Logical formLearned from116 sentences. A source can be close to a person.Logical formLearned from116 sentences. Sources can be in a us-state.Logical formLearned from116 sentences. A source can be in a delegation.Logical formLearned from116 sentences. An agency may quote a source.Logical formLearned from116 sentences.