text: def deep_reverse(L):
      """ assumes L is a list of lists whose elements are ints
      Mutates L such that it reverses its elements and also 
      reverses the order of the int elements in every element of L. 
      It does not return anything.
      """
      global L
      lis1 = []
      for i in range(len(L)-1,-1,-1):
          lis1.append(L[i])
      lis2 = []
      for i in range(len(lis1)):
          lis3 = []
          for j in range(len(lis1[i])-1,-1,-1):
              lis3.append(lis1[i][j])
          lis2.append(lis3)
      L = lis2
  
  
  L = [[0, 1, 2], [1, 2, 3], [3, 2, 1], [10, -10, 100]]
  print(deep_reverse(L))
  print(L)
  