List levels using code blocks

Hello everyone, is there any way to get the item in level one by using code block to get 12 items on the list instead of 36?

Can you explain what you’re after with a sketch? Perhaps simplify the numbers? I’m having a hard time understanding what you want for a result.

hello jacob , here it is

just what i wanted to get every element in L to be in the equation , L has 3 sub lists in total of 12 items this only what i wanted, without needing to code by python . could be this possible ?

Still not entirely clear for me.

Perhaps try defining an extra variable for your stop point. That might help you see what the issue is.

X = 2*W -0.1;
Stop = L-X;
Seq = 0.5..Stop..W;