input: Write a Python function to sum pairs of adjacent numbers in a provided list.  
  assert sum_adjacent_pairs([1, 1, 3, 4, 4, 5, 6, 7]) == [2, 4, 7, 8, 9, 11, 13]  
  assert sum_adjacent_pairs([4, 5, 8, 9, 6, 10]) == [9, 13, 17, 15, 16]  
  assert sum_adjacent_pairs([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == [3, 5, 7, 9, 11, 13, 15, 17, 19]
output: def sum_adjacent_pairs(lst):
      return [lst[i] + lst[i + 1] for i in range(len(lst) - 1)]