A country may close borders.Logical formLearned from166 sentences. A (border region) can be volatile.Logical formLearned from165 sentences. A (border security) can be increased.Logical formLearned from165 sentences. Persons can be across a border.Logical formLearned from164 sentences. A border can be dark.Logical formLearned from164 sentences. A stretch can be constituted-of-or-filled-with border.Logical formLearned from164 sentences. A border may cross point.Logical formLearned from164 sentences. Borders may be closed.Logical formLearned from162 sentences. A border can be secure.Logical formLearned from161 sentences. A border can be undefended.Logical formLearned from160 sentences. Borders can be defined.Logical formLearned from160 sentences. (Border states) may pertain-to a country.Logical formLearned from160 sentences. A border may pertain-to a state.Logical formLearned from159 sentences. Borders can be closed.Logical formLearned from158 sentences. Control can be over borders.Logical formLearned from158 sentences.