b. Hetero

1 min 20 secs

3 mins 11 secs

41 secs

42 secs

1 min 2 secs

21 secs

1 min 25 secs

24 secs

1 min 37 secs

52 secs

1 min 21 secs

53 secs

33 secs

1 min 18 secs

12 secs

1 min 47 secs

16 secs

1 min 6 secs

1 min 16 secs

1 min 3 secs

2 mins 9 secs

20 secs

37 secs

20 secs

20 secs

20 secs

7 mins 12 secs

3 mins 11 secs

9 mins 19 secs

10 mins 51 secs

5 mins 22 secs

9 mins 53 secs

23 secs

1 min 18 secs

2 mins 20 secs

10 mins 8 secs

1 min 4 secs

6 mins 58 secs

5 mins 8 secs

6 mins 22 secs