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Logic
Sherlock holmes - I will sent you a train with a lock on it the secret documents are there. (the train arrived) Robbers - oh no it is a high tech lock. Agent Chet- watson but we don't have a key to open this lock too how will we get the secret information if sherlock sends the key the robbers will take it. Watson - do not worry we have a lock of our own. Agent Chet - I on't understand you. Watson - Come here i will tell you sherlocks plan. ( a few hours later ) Watson - atlst we got the documents! What was Sherlocks plan?
