include "delayed_updating/syntax/prototerm_constructors.ma".
include "delayed_updating/syntax/prototerm_eq.ma".
include "delayed_updating/syntax/path_head.ma".
-include "delayed_updating/syntax/path_depth.ma".
include "delayed_updating/notation/relations/black_rightarrow_df_3.ma".
include "ground/xoa/ex_4_3.ma".