code: def tersoff_input(self, structure, periodic=False, uc=True, *keywords):
          
          #gin="static noelectrostatics \n "
          gin = self.keyword_line(*keywords)
          gin += self.structure_lines(
              structure, cell_flg=periodic, frac_flg=periodic,
              anion_shell_flg=False, cation_shell_flg=False, symm_flg=not uc
          )
          gin += self.tersoff_potential(structure)
          return gin
docs: Gets a GULP input with Tersoff potential for an oxide structure
  
          Args:
              structure: pymatgen.core.structure.Structure
              periodic (Default=False): Flag denoting whether periodic
                  boundary conditions are used
              library (Default=None): File containing the species and potential.
              uc (Default=True): Unit Cell Flag.
              keywords: GULP first line keywords.