Borders may pertain-to a state.Logical formLearned from49 sentences. A border can be simple.Logical formLearned from49 sentences. Borders may be closed.Logical formLearned from49 sentences. A (border region) can be porous.Logical formLearned from49 sentences. Thousands can be constituted-of-or-filled-with (border guards).Logical formLearned from49 sentences. Borders may open.Logical formLearned from49 sentences. A border may be considered.Logical formLearned from49 sentences. A person may cross a border.Logical formLearned from49 sentences. A border can be formal.Logical formLearned from49 sentences. A border can be geographical.Logical formLearned from48 sentences. Borders can be formal.Logical formLearned from48 sentences. A river can be a border.Logical formLearned from48 sentences. A border may pertain-to a municipality.Logical formLearned from48 sentences. Stretches may pertain-to a border.Logical formLearned from48 sentences. A person may hop a border.Logical formLearned from48 sentences.