input: Write a function to take a list of strings and generate a list of lists of words from the strings. The returned list should have the first word for each string followed by following words for each string. The function should be named `get_word_lists`.
  
  Input:
  
  ["Hello world", "This is a test"]
  
  
  Output:
  
  def get_word_lists(strings):
      word_lists = []
      for string in strings:
          words = string.split(" ")
          word_list = []
          for i in range(len(words)):
              word_list.append(words[i:])
          word_lists.append(word_list)
      return word_lists
  
  word_lists = get_word_lists(["Hello world", "This is a test"])
  assert word_lists == [[["Hello", "world"]], [["This", "is", "a", "test"]]]
output: def get_word_lists(strings):
      word_lists = []
      for string in strings:
          words = string.split()
          word_list = []
          for i in range(len(words)):
              word_list.append(words[i:])
          word_lists.append(word_list)
      return word_lists