include "ground/xoa/or_5.ma".
include "ground/xoa/ex_3_1.ma".
include "ground/xoa/ex_4_2.ma".
include "ground/xoa/ex_4_3.ma".
include "ground/xoa/ex_5_3.ma".
include "ground/xoa/or_5.ma".
include "ground/xoa/ex_3_1.ma".
include "ground/xoa/ex_4_2.ma".
include "ground/xoa/ex_4_3.ma".
include "ground/xoa/ex_5_3.ma".