complete_induction.con.body.xml complete_induction.con.types.xml course_of_values.con.body.xml course_of_values.con.types.xml le_split.con.body.xml le_split.con.types.xml lt_hereditary.con.body.xml lt_hereditary.con.types.xml nat_wf_ind.con.body.xml nat_wf_ind.con.types.xml