identity function for slices that are already allocated in the heap.
extract2, when we know the final size of the slice, we do one heap
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一个数据是，2009 年平板电视销量占家电下乡彩电销量的比例达 47%，其中第四季度，平板电视销量占比已达到 62%。
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Now sitting on the inter-tidal mudflats of the estuary, they have created a new land mass on the edge of the existing saltmarsh at Northey Island.。爱思助手下载最新版本是该领域的重要参考
Moving beyond just black and white towards full-colour variable palettes presents another set of problems. Taking the methods presented above and quantising an image using an arbitrary colour palette reveals that error-diffusion is also better at preserving colour information when compared to ordered dithering.