A size of (toy train) may unlock a mystery.Logical formLearned from2 sentences. An agreement may unlock deals with a country.Logical formLearned from2 sentences. Three-quarters may provide a key to unlocking a defense.Logical formLearned from2 sentences. (String theory) may unlock mysteries of black holes.Logical formLearned from2 sentences. A program may unlock a property.Logical formLearned from2 sentences. A skill may unlock a (colon defense).Logical formLearned from2 sentences. An agreement may unlock some problems.Logical formLearned from2 sentences. A man may unlock a door with an (antique key).Logical formLearned from2 sentences. A male may unlock gates of a cathedral.Logical formLearned from2 sentences. Sites may unlock history of persons.Logical formLearned from2 sentences. A person may unlock a method.Logical formLearned from2 sentences. Scientists may unlock secrets of tuberculosis.Logical formLearned from2 sentences. Shelters may unlock in case of attacks.Logical formLearned from2 sentences. Prisoners may unlock cells.Logical formLearned from2 sentences. A guard may unlock a gate.Logical formLearned from2 sentences.