A substance may unlock a series of memories.Logical formLearned from2 sentences. A person may unlock mysteries of elements.Logical formLearned from2 sentences. A key can be to unlocking a market.Logical formLearned from2 sentences. A key to unlocking a market can be (trade agreement).Logical formLearned from2 sentences. Scientists may unlock secrets of new materials.Logical formLearned from2 sentences. A document may unlock in a database.Logical formLearned from2 sentences. A (pin number) may unlock software.Logical formLearned from2 sentences. A program may permit editing of electronic books by unlocking an (electronic book format).Logical formLearned from2 sentences. A code may unlock by a key.Logical formLearned from2 sentences. A purchasing-department may unlock (security cables).Logical formLearned from2 sentences. A male may unlock door.Logical formLearned from2 sentences. A person may unlock doors to an entrance.Logical formLearned from2 sentences. A (screen door) may be unlocked.Logical formLearned from2 sentences. A female may unlock a (coal house door).Logical formLearned from2 sentences. A key can be to unlocking an identity.Logical formLearned from2 sentences.