Space or c to make new list. S to merge the two sublists together. This is a work-in-progress on a variation block merge sort, where the sorting algorithm uses a different method to merge two sublists together, by splitting both sublists into blocks, inserting, merging, and swapping the blocks under certain rules, and using insertion sort to make it truly sorted.
https://en.wikipedia.org/wiki/Block_sort The article may be confusing a first, so make sure to read very carefully.