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Ok, if you are a free user, this will be useful. After a long time to search, I found that we can launch more than one ec2 instance. But we need to attention that the time limited to 750 hours per-month, one instance spend 720 hours one month, so if we launch two instances, we will spend 1440 hours one month. That will be cost extend charge, which part overhead 750 hours. So, have a fun :D