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hey everyone and welcome to todays video were gonna go over another Google question this one might be a bit trickier than last one so lets jump straight into it given a string we want to delete any character if its already been used and returned the new string so essentially were going to be deleting any reoccurring characters and were going to be returning what the string would look like without them so in this case a abbc see we can see that this a this B and this C are reoccurring characters because there is already a C a B and an A somewhere before that in the string so in this example we would just print out ABC now Im gonna give you guys a little second to try and figure it out pause this video if you need to and try and think of a solution all right so the solution were gonna be using today involves two data structures the first one is a set and the second one is an empty string which will populate so what we want to do is our algorithm is going to go through every singl