demo, R - rextester

demo

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Absolute running time: 0.31 sec, cpu time: 0.53 sec, memory peak: 31 Mb, absolute service time: 0,31 sec

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   col1 col2
1     A    1
2     B    1
3     C    1
4     D    1
5     E    1
6     A    2
7     B    2
8     C    2
9     D    2
10    E    2
11    A    3
12    B    3
13    C    3
14    D    3
15    E    3

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