All of the examples demonstrating ordered dithering so far have been produced using a specific type of threshold matrix commonly known as a Bayer matrix. In theory however any matrix could be used and a number of alternatives are available depending on your qualitative preference. Matrices also don’t have to be square or even rectangular; polyomino-based dithering matrices have been explored as well[6].
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The categories are broken into four sections: users under 13 years of age, over 13 years of age under 16, at least 16 years of age and under 18, and "at least 18 years of age."
// 易错点1：边界处理 - 空链表直接返回空数组