correct use of let

1:01

6:42

15:37

16:32

00:29

4:44

21:05

3:36

26:18

12:06

13:30

6:51

6:55

3:22

19:14

3:16

4:02

4:40

4:38

7:05

4:42

7:31

6:50

4:59

6:23

9:34

6:00

1:58

5:39

8:02

1:52

4:05

24:17

6:01

7:00

1:43

5:38

1:36:20

4:13

8:44

7:38

4:51

5:51

5:55

9:16

21:27

2:34

3:29

8:26

31:17

3:22

4:44

3:35

9:24

5:00

2:39

5:03

3:28

11:32

2:49