How to turn a very long list into smaller lists



I have a list that is very long and I need to break it into smaller
lists of say 50 elements (the original list is a muliple of 50.

as for now I am just using lrange function which is extremy slow on a
long list of say 100000 items.

thanks in advance

Mel

PS: is there an option on the split command to do this ?
.



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