Re^2: in file insert character in every row on nth position

YES,

Here is the sample data

2016-02-06-0240:00
2016-02-06-0540:00
2016-02-06-0740:00
[download]

expected output

2016-02-06-02:40:00
2016-02-06-05:40:00
2016-02-06-07:40:00
[download]

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