1
0 10
2
1 20
3
2 30
4
3 40
5
10
6
20
7
30
8
40
9
a 100
b 200
11
c 300
12
apple
13
bear
14
car
15
0 apple
16
1 bear
17
2 car
18
19
21
22
23
24
25
26
27
This is each