code: def flat_list_to_polymer(atom_list, atom_group_s=4):
      
      atom_labels = ['N', 'CA', 'C', 'O', 'CB']
      atom_elements = ['N', 'C', 'C', 'O', 'C']
      atoms_coords = [atom_list[x:x + atom_group_s]
                      for x in range(0, len(atom_list), atom_group_s)]
      atoms = [[Atom(x[0], x[1]) for x in zip(y, atom_elements)]
               for y in atoms_coords]
      if atom_group_s == 5:
          monomers = [Residue(OrderedDict(zip(atom_labels, x)), 'ALA')
                      for x in atoms]
      elif atom_group_s == 4:
          monomers = [Residue(OrderedDict(zip(atom_labels, x)), 'GLY')
                      for x in atoms]
      else:
          raise ValueError(
              'Parameter atom_group_s must be 4 or 5 so atoms can be labeled correctly.')
      polymer = Polypeptide(monomers=monomers)
      return polymer
docs: Takes a flat list of atomic coordinates and converts it to a `Polymer`.
  
      Parameters
      ----------
      atom_list : [Atom]
          Flat list of coordinates.
      atom_group_s : int, optional
          Size of atom groups.
  
      Returns
      -------
      polymer : Polypeptide
          `Polymer` object containing atom coords converted `Monomers`.
  
      Raises
      ------
      ValueError
          Raised if `atom_group_s` != 4 or 5