2
7
1
8
2
8
8
2
size=3
size=3
size=2
head
NULL
2
7
1
8
2
8
1
8
2
size=3
size=4
size=2
head
NULL
7
1
8
2
8
1
8
2
size=2
size=4
size=2
head
NULL
2
2
3
4
3
3
3
5
4
4
2
5
4
4
2
1
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