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I leave my house and walk straight until I get to the corner then I turn right, I walk straight and turn left at the next corner, I continue to walk straight and then turn right again, at the next corner I turn left and walk straight until i reach the last corner, I turn left again and then I'm at the post office.
Look at the map. Imagine you're at home and you want to go to the post office. Which way should you go?