I'm trying to process the following virtual pages in the 4 page frames in order: 3,4,6,5,7,4,8 Now, I completely understand the LRU stack implementation. But, when I implement LRU using OBL (One-Block-Lookahead), I seem to have a duplicate page number in the frame. Is that possible? Implementation using LRU and OBL: 3,4,6,5,7,4,8 3: - 3, , ,4 4: hit 6: - 3,6,…