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Once upon a time, a little bicycle named Speedy loved racing down hills. One sunny afternoon, Speedy zoomed down a steep hill, feeling the wind rush past its handlebars. But Speedy had been so excited, it forgot to check its tire pressure. Suddenly, with a loud "Psssst!", the front tire went flat. Speedy wobbled, trying to stay upright, but it was no use. With a gentle thud, Speedy tipped over onto the grass. From then on, Speedy always checked its tires before every adventure.