Access the page replacement simulator referenced in this section. This and other animations are available here: http://williamstallings.com/COA/Animation/Links.html.

What is the minimum number of page frames required in a system for which the following list of references will hit at least 50% of the time? You will need to copy and paste the list of references into the simulator.

19 4 3 5 9 9 1 7 6 16 8 8 4 3 10 8 19 15 1 15 8 2 10 7 11 18 17 15 19 9 16 15 19 1 8 6 5 17 5 19 12 12 4 2 14 9 17 20 18 1 18 12 13 11 20 6 17 14 9 7 9 3 13 20 2 15 8 15 20 7 7 10 20 19 1 19 18 5 7 18 13 11 17 12 20 10 18 9 13 3 6 14 5 13 2 19 3 19 6 7