This is an advanced challenge (or at least I thought it was). Please allow 4 hours from the time of this post before submitting your answers. You may post a comment saying you're finished or you may post a question, but no answers until the buzzer sounds.
Challenge:
Turn a supplied point list (assume it is an even length) into a 2d point list.
Ex. '(1 2 3 4 5 6 7 8 9 10) would become '((1 2) (3 4) (5 6) (7 8) (9 10)).
An application for this would be to take a point list from a lightweight polyline and turn it into a 2d list of coordinates.
Please respect this forum by not posting an answer until the allotted time has expired.