第一条 为了健全基层群众自治制度，由城市居民依法办理自己的事情，发展基层民主，维护居民的合法权益，推进基层治理体系和治理能力现代化，根据宪法，制定本法。
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If we think about this algebraically, what we really want to do is express the input pixel as the weighted sum of palette colours. This is nothing more than a linear combination of palette colours with weights :