Using a Splice Rater to Trim an Array of Arrays?

With sparse rays, if you leave blank spaces within the array, then four in or four of will skip over them because they don't exist. With with a for more in lanke afor inor for ever ya, four in and four mor inand for only goes to empty items. I have done some testing with using new array and giving it a number, versus doing array dot from versus do array dot length. And basically, what i have found has been that, if it's something that would be unexpected to a human whether how how it will be optimized will basically be at random.