This actually happened to me only I was one of the pedestrians! Ta tell ya the truth I can't hear worth a ship. Just ask my wife. Anyway I was completely shocked when I turned and the guy was walking his bike around me. I said sorry and he said none needed. I also said nice bike as he rode off...
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)