(* *)
(**************************************************************************)
+include "ground_2/xoa/ex_1_2.ma".
+include "ground_2/xoa/ex_3_4.ma".
+include "ground_2/xoa/ex_4_4.ma".
+include "ground_2/xoa/ex_4_5.ma".
include "ground_2/relocation/rtmap_id.ma".
include "static_2/notation/relations/relation_4.ma".
include "static_2/syntax/cext2.ma".