Rearrange list according to an existing one

Grasshopper
,
1

Hi everyone, newby here.

I’m in a weird situation here.
Actually I’ve a list A, and a list B.
A and B are composed by the same amount of items (36), but A doesn’t have any branch, and B is composed by 12 branches, each one composed by 3 element.
Is there any way I can turn the structure of A the same as B? and is there a way to make this process parametrically adjustable? Thanks in advance.

2

Partition List with ‘S’ (Size) input set to 3.

partition_2022Jan28a

3

Thanks so much!
The solution has been always under my nose lol