Exercise

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The log file looks like this:

examples/regex/timelog.log

09:20 Introduction
11:00 Exercises
11:15 Break
11:35 Scalars
12:30 Lunch Break
13:30 Exercises
14:10 Solutions
14:30 Break
14:40 Arrays
15:40 Exercises
17:00 Solutions
17:30 End

09:30 Advanced Arrays
10:30 Break
10:50 Exercises
12:00 Solutions
12:30 Hash fuction introduction
12:45 Lunch Break
14:15 Exercises
16:00 Solutions
16:15 Break
16:30 Subroutines
17:00 Exercises
17:30 End

the report should look something like this:

09:20-11:00 Introduction
11:00-11:15 Exercises
11:15-11:35 Break ...

and

Solutions: 95 minutes 9%
Break 65 minutes 6% ...