For:
![](http://ntala.chinchillareactor.com/wp-content/uploads/2019/11/image-20.png)
from 1 to 8 in 2 steps. 9 should be the next number, but 8 is the limit
![](http://ntala.chinchillareactor.com/wp-content/uploads/2019/11/image-21.png)
listing:
![](http://ntala.chinchillareactor.com/wp-content/uploads/2019/11/image-22.png)
While
where len is a the length of the list
![](http://ntala.chinchillareactor.com/wp-content/uploads/2019/11/image-23.png)
from 1 to 8 in 2 steps. 9 should be the next number, but 8 is the limit
listing:
where len is a the length of the list