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This answer has inspired me to a question: say you are a castaway on a desert island. There might be a plane flying casualy but you can miss it. So you want to create some pattern (e.g. put some br...
This answer has inspired me to a question: say you are a castaway on a desert island. There might be a plane flying casualy but you can miss it. So you want to create some pattern (e.g. put some br...