concentration calculations

4:25

21:55

6:04

3:28

4:11

14:22

1:15

12:24

5:29

21:27

3:14

5:05

8:46

5:29

20:42

23:11

4:54

17:25

17:36

9:43

5:41

16:49

5:51

53:22

30:53

9:42

3:02

4:50

2:42

29:47

3:57

18:35

5:06

12:06

6:00

2:51

2:30

5:13

9:50

5:36

5:30

11:44

8:42

1:57

8:07

5:38

28:17

25:16

13:20

2:16

15:00

7:50

4:06

27:05

6:18

4:40

5:09

8:05

12:16

12:52