Secrets can be nasty.Logical formLearned from57 sentences. Secrets can be between persons.Logical formLearned from57 sentences. A secret can be tragic.Logical formLearned from57 sentences. A country may steal secrets.Logical formLearned from56 sentences. Secrets may be kept.Logical formLearned from56 sentences. Persons may have a secret.Logical formLearned from56 sentences. Secrets may pertain-to a world-city.Logical formLearned from56 sentences. A secret can be to a long life.Logical formLearned from55 sentences. A person may share a secret.Logical formLearned from55 sentences. A secret of clean energy can be that something-is-the-case.Logical formLearned from55 sentences. A person may reveal secrets.Logical formLearned from55 sentences. A head may pertain-to a (secret police).Logical formLearned from55 sentences. (Defense secrets) may pertain-to a country.Logical formLearned from55 sentences. A male may keep secrets.Logical formLearned from54 sentences. Persons may know a secret.Logical formLearned from54 sentences.