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一个个水果新品种从“高价尝鲜”变成日常消费品，表明消费升级不只在购买力更强，也在供给侧更优
As we try to refactor the code to work this way, one question comes up — what should we do when there's an error (such as an invalid number of sides)? A number of utilities that I use seem to have a common convention for reporting errors (i.e. printing the name of the program before printing the actual error message), but what actually is this convention? It turns out that this originally came from the GNU coding standards! I did not know this until this experiment, and the fact that I didn't doesn't reflect well on the success of the mission of the GNU project.
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