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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def tersoff_input(self, structure, periodic=False, uc=True, *keywords):
 """ 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. """

        #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