solid explanation

5 mins 1 sec

3 mins 42 secs

2 mins 15 secs

3 mins 3 secs

2 mins

4 mins 12 secs

2 mins 27 secs

4 mins 11 secs

5 mins 18 secs

7 mins 7 secs

5 mins 36 secs

2 mins 8 secs

5 mins 2 secs

9 mins 45 secs

10 mins 16 secs

21 mins 8 secs

17 mins 55 secs

10 mins 12 secs

6 mins 45 secs

6 mins 19 secs

5 mins 17 secs

7 mins 18 secs

10 mins 7 secs

11 mins 40 secs

10 mins 32 secs

16 mins 48 secs

17 mins 53 secs

6 mins 21 secs

5 mins 29 secs

7 mins 42 secs

10 mins 36 secs

21 mins 30 secs

11 mins 51 secs

13 mins 7 secs

13 mins 23 secs

13 mins 11 secs

8 mins 1 sec

12 mins 24 secs

7 mins 9 secs

5 mins 15 secs