A (gas leak) can be accidental.Logical formLearned from21 sentences. A (gas leak) may kill thousands.Logical formLearned from21 sentences. Demonstrators can be with gas.Logical formLearned from21 sentences. Police may fire gas on (opposition supporters).Logical formLearned from21 sentences. Worth can be constituted-of-or-filled-with gas.Logical formLearned from21 sentences. A wave can be constituted-of-or-filled-with gas.Logical formLearned from21 sentences. A natural gas can be high.Logical formLearned from21 sentences. A tax can be on gas.Logical formLearned from21 sentences. A reserve can be constituted-of-or-filled-with natural gas.Logical formLearned from21 sentences. Gas may be used by police.Logical formLearned from21 sentences. Gas can be at protesters.Logical formLearned from21 sentences. A country may place (nerve gas).Logical formLearned from21 sentences. A fire may be started by a (gas stove).Logical formLearned from21 sentences. Police may throw gas.Logical formLearned from21 sentences. Gas may be piped through a country.Logical formLearned from21 sentences.