Example of Python implementation of traversal operations with subscript indexes

0   a
1   b
2   c
3   d
4   e
5   f
6   g
7   h
8   i
9   g
10  k
11  l
12  m
13  n
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0 a
1 b
2 c
3 d
4 e
5 f
6 g
7 h
8 i
9 g
10 k
11 l
12 m
13 n