Riddle: I swim with the sky, yet travel below. I signal the…

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i-dont-fly-yet-i-change-the-sky-in-the-dark-i-work-but

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i-wear-a-mask-both-day-and-night-i-fly-in-silence-out

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i-wear-my-home-upon-my-back-no-luggage-do-i-lack-across

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i-move-without-legs-i-strike-without-arms-you-may-hear

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i-build-my-home-with-no-doors-or-locks-my-neighbors-do