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The uneven green after being dyed blue is exactly what we want.If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza.Difference mode. According to the brightness distribution of the colors on the upper and lower sides, the color values of the upper and lower pixels are subtracted. For example, if the maximum white value is used for Difference operation, the inverted effect will be obtained (the lower color is subtracted to obtain the complement value), while if the black value is used, there will be no change (the black brightness is the lowest, the lower color subtracts the minimum color value of 0, and the result is the same as before).北京的深夜是灯火阑珊，热闹而繁忙的。近年兴起的专车更是在深夜成为城市人出行的主要工具。专车司机李南是一名午夜司机，只在午夜出车。他在专车内邂逅不同的人，见证不同的故事，人间百态，本剧将在一辆专车内还原生活的本来面貌。6. Ships engaged in mine clearance operations shall display three ring green lights or three spheres in addition to the lights or types specified for motor ships in Article 23 or anchor ships in Article 30. One of these lights or types shall be displayed near the top of the foremast, and the rest shall be displayed at each end of the foremast spine. These lights or patterns indicate张槐赞道：好。