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tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.
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Белорусская теннисистка ранее стала амбассадором модного дома, а сегодня посетила шоу в качестве гостьи. Помимо спортсменки, на мероприятии заметили Ренату Литвинову и Деми Мур, певца Шона Мендеса, а также Николь Кидман, Анну Винтур и Пэрис Хилтон.
At about 14:30 on 9 September, Prime Minister KP Sharma Oli resigned and Nepal's government collapsed. By nightfall, buildings were burning across Kathmandu, and at least 50 more people were reported dead.