prasantadh

"""
algorithm
  sort list of size 2 starting at index multiple-of-2
  sort list of size 4 starting at index multiple-of-4
    by merging sorted list of size half-of-4
  sort list of size 8 starting at index multiple-of-8
    by merging sorted list of size half-of-8
  ...
  ...
  sort list of size full-list-size at index full-list-size