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Finally, for my 13th birthday, I got a skateboard — a Black Knight with those cool black urethane wheels. I cut my teeth on that board — and ate shit on it many, many times.

After every test (except those at 30 mph) the wheel was cleaned by making two stops with cleaning shoes from a speed of 40 miles per hour.

Тheoretical amplitudes of primary minima Аmₛ (transits) versus the mass-ratio for different inclinations and fill-outs.