Group 1 - The core point of the article is that the American Petroleum Institute (API) reported an increase in U.S. crude oil inventories by 13.4 million barrels for the previous week [1] Group 2 - The data was released on February 20, indicating significant changes in oil inventory levels [1] - The increase in inventory may have implications for oil prices and market dynamics [1]

Core Insights - The API crude oil inventory in the U.S. increased by 622,000 barrels last week, contrary to expectations of a decrease of 3.4 million barrels [1] - The previous week's inventory showed a decrease of 974,000 barrels [1] Inventory Data - Current inventory change: +622,000 barrels [1] - Expected inventory change: -3.4 million barrels [1] - Previous inventory change: -974,000 barrels [1]