there are \frac{n(n-1)}{2} factors in total.
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He had pulled a thread attached to a flat, rectangular piece of waffle-like material segregated into dozens of wonky-looking square tiles. With that careful pull, the slab compressed together, suddenly stood up, and took on the shape of a tiny, curvy, modernist-style chair.，详情可参考im钱包官方下载
The new iPad Air with M4 is compatible with the Apple Pencil (USB-C), Apple Pencil Pro, and the Magic Keyboard for iPad Air, all of which can be purchased separately.