Consider the following trace from page replacement:

Page Access Algorithm State
0 0
1 0, 1
2 0, 1, 2
0 1, 2, 0
1 2, 0, 1
3 0, 1, 3
0 1, 3, 0
3 1, 0, 3
1 0, 3, 1
2 3, 1, 2
1 3, 2, 1