Thinking Step 2: 推理第一个人。如果他不想要，他会直接说“不”（因为只要有一个不要，全称命题为假）。他说“不知道”，说明他自己想要，但他不确定后面两个人想不想要。
More on this storySalmon 'at risk of extinction' as study launched
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Sir Keir said the law would be enforced by fines and other measures yet to be determined, by a "combination of oversight bodies in relation to what's online and then it will be a criminal matter".
Uniform regions (solid backgrounds, smooth gradients) get stored as large blocks. Detailed regions (edges, textures) get subdivided into smaller blocks. You end up with a compressed representation that preserves detail where it exists and simplifies where it can.