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Anonymous #11535905 earned the "Hackathon" achievement

Anonymous #11535905 completed the "2 + 3 = 5" task on attempt 2

Anonymous #11535905 is making attempt 2 to complete the "2 + 3 = 5" task

是零陆啊 started the lesson entitled "练习使用集合"

Anonymous #11531661 started the lesson entitled "Nuances of objects in Java"

Anonymous #11535905 is making attempt 1 to complete the "2 + 3 = 5" task

Anonymous #11531661 completed the "Who here is a descendant?" task on attempt 1

Anonymous #11531661 is making attempt 1 to complete the "Who here is a descendant?" task

是零陆啊 completed the "你好，《星际争霸》！" task on attempt 1

是零陆啊 is making attempt 1 to complete the "你好，《星际争霸》！" task

dty completed the "编程天才的休息时间:流处理" task on attempt 1

Anonymous #11535905 completed the "无需注释" task on attempt 1