You see, beta, in a closed pipe the air can only vibrate at one closed end, so it makes only those harmonics which are odd multiples of the fundamental frequency—the even ones get cancelled out. I think of it like my Usha machine: if the belt skips a tooth on the wheel, the whole rhythm changes and you only get every other stitch. My quiet nights fixing uniforms taught me that some patterns just cannot form, yaar.
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