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hello everyone welcome or welcome back to my channel so today we are going to discuss another problem but before going forward if you have not liked the video please like it subscribe to my channel and hit the bell icon so that you get notified whenever post a new video so without any further ado lets get started problem is remove duplicate letters we are given a string and we need to remove the duplicate letters so that every letter appear only once you make sure that your result is the smallest in the lexographical order lexographical order means when we have ascending order so like this is a string so if there are all permutations of the string and those are arranged in the ascending order so our string whatever string we will make that should be in the like the smallest in the lexographical order meaning it should be the smallest among all possible results okay so uh lets see how we can approach this problem here c this test case b c a b c so here what we are doing is we are tak