Group 1 - The core idea of the article is to promote a summer discount campaign by Ctrip, encouraging users to plan their travel and take advantage of the offers available through the Ctrip app [2][3]. Group 2 - The campaign offers discounts based on the amount spent: a discount of 25 yuan for purchases over 500 yuan, 100 yuan for over 2000 yuan, and 350 yuan for over 7000 yuan [6][7]. - The campaign is available to users who hold a specific type of credit card (62-starting Dragon Card) and register as members on the Ctrip app [6][7]. - The total number of discounts available is limited: at least 5550 for the 25 yuan discount, 3750 for the 100 yuan discount, and 1800 for the 350 yuan discount, with the discounts allocated on a first-come, first-served basis [6][7].