Sure, here's a comparison of bubble sort to a few other common sorting algorithms in terms of time complexity:

- Insertion sort: O(n^2)
- Selection sort: O(n^2)
- Merge sort: O(n log n)
- Quick sort: O(n log n)
- Heap sort: O(n log n)

As for the number of steps required to sort a list of letters from Z to A to its original state of A to Z, it would depend on the size of the list and the specific implementation of the sorting algorithm. However, generally speaking, bubble sort would require the most steps, since it has a time complexity of O(n^2). Insertion sort and selection sort would also require many steps for large lists. Merge sort, quick sort, and heap sort would all require fewer steps, since they have a more efficient time complexity.
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