Reference can be to an order.Logical formLearned from35 sentences. A reference can be to himself.Logical formLearned from35 sentences. Reference can be to a character.Logical formLearned from35 sentences. References can be to a text.Logical formLearned from35 sentences. A reference can be dated.Logical formLearned from35 sentences. Reference can be to a son.Logical formLearned from35 sentences. An author may pertain-to a reference.Logical formLearned from35 sentences. References can be to an object.Logical formLearned from35 sentences. A reference can be to a company.Logical formLearned from35 sentences. Reference can be to circumstances.Logical formLearned from35 sentences. References can be documentary.Logical formLearned from35 sentences. A reference can be to a day.Logical formLearned from35 sentences. Reference can be to a possibility.Logical formLearned from35 sentences. A reference can be to a security-council.Logical formLearned from35 sentences. A reference can be polite.Logical formLearned from35 sentences.