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Group 1 - The article highlights the importance of weekly announcements from Sunday to Thursday, which include significant stock market events such as suspensions, investments, acquisitions, and performance reports [1] - Key announcements are marked in red to assist investors in identifying potential investment hotspots and avoiding black swan events, providing ample time for analysis [1] - Specific companies are mentioned for their involvement in various sectors, such as a company selling cooling systems for lithography machines and another providing reliability testing services for major military groups [1] Group 2 - A company in the semiconductor and satellite navigation sectors reported a net profit growth of over 10 times year-on-year in the first half of the year [1]