concentration calculation

4:25

6:04

21:55

5:29

3:28

12:24

1:15

14:22

5:29

21:27

5:05

4:11

16:49

11:00

23:11

4:54

8:46

17:25

18:35

9:43

5:41

30:53

3:57

5:51

5:13

4:50

9:42

3:02

2:42

5:06

5:36

2:51

11:44

20:42

4:10

2:30

7:17

4:48

28:41

5:38

7:38

10:12

9:50

3:53

13:20

6:18

28:17

6:44

2:16

8:01

5:06

7:18

4:55

7:55

5:27

6:55

3:48

10:13

17:41

50:55