Group 1 - The article discusses the measures implemented by the 12306 ticketing system to ensure fair ticket purchasing, including a comprehensive anti-bot system that analyzes access frequency, operational behavior, device characteristics, account reputation, and network IP [1] - The 12306 system has established a set of risk prevention strategies, such as rejecting abnormal login requests and placing suspicious ticket orders into a slow queue for further verification [1] - The system also delays processing for abnormal backup ticket orders during the submission phase, ensuring a more secure purchasing environment [1] Group 2 - The article references discussions around third-party ticket purchasing services being labeled as "attack-style access" by the 12306 platform [2] - It highlights the advanced architecture of the 12306 system, emphasizing its robustness and capability to handle high traffic [2] - The official explanation regarding the absence of displayed queue numbers for backup ticket purchases is also mentioned, indicating a focus on user experience and system efficiency [2]