Hi, codeforces! I know that there is given short time to delete comment after publucation (sorry for my poor English, I mean that you can delete your comment if you posted it not earlier than minute ago, or something like this). But can I delete my comment if I wrote it a week/month/year ago? If not, why? I think ability to delete your old comments can be a userful feature. For example, I want to delete all blogs, comments, change handle and start with a clean slate on this account.