Very basic question

Another approach would be, to only “generate” the points that are needed - less juggling with the data, use
one inner circle
first outer circle
2nd outer circle, rotated “half step”.

divide all circles by the number of “L”-shaped Polylines.

windmill_Ls_00.gh (12.5 KB)

and yes as @N_I_C_K already mentioned - maybe use a better title and post a .gh file… see all tipps here: