there are \frac{n(n-1)}{2} factors in total.
В Москве прошла самая снежная зима14:52
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Friedmann was the sort of activist that people who normally can’t abide activists could appreciate. He seemed more like a professor, maintaining a neat white goatee, and wearing button-down shirts, ties, and rimless glasses. Allies and critics alike described him as brilliant and single-mindedly devoted to his cause, yet also as so rational and eloquent that he won over law-and-order conservatives and recalcitrant public officials. He could be vain, but he was better known for his gentleness.
Цены на один вид жилья в России снизились20:41