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С разгона пролететь в кольцо с наклонной поверхности (поищи такую сзади на стене), разогнаться сверху (наверх забраться не сложно).
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"But i really can't do a good job... any job of explaining magnetic force in terms of something else that you're more familiar with, because i don't understand it in terms of anything else that you're more familiar with."
© Richard Feynman
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