diff --git a/.gitignore b/.gitignore
index 94e8588..2cb0994 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,7 @@ toto
 
 tools/*.obj
 ! tools/minimal.obj
+! tools/cube.obj
 tools/read_obj
 tools/*.xyz
 tools/*.asc
diff --git a/edges.c b/edges.c
index 209bf59..7e0ba49 100644
--- a/edges.c
+++ b/edges.c
@@ -65,6 +65,26 @@ return 0;
 }
 /* --------------------------------------------------------------------- */
 /*
+ *	with this func, you can search for duplicates, but 
+ *	it is going to be SLOW with huges object.
+ */
+static int is_edge_in_list(EdgeList *list, int p0, int p1)
+{
+int		idx;
+
+for (idx=0; idx < list->fidx; idx++) {
+	if (	(list->edges[idx].A == p0) &&
+		(list->edges[idx].B == p1) )		return 1;
+
+	if (	(list->edges[idx].A == p1) &&
+		(list->edges[idx].B == p0) )		return 2;
+	}
+
+return 0;		/* NOT FOUND */
+}
+/* --------------------------------------------------------------------- */
+/*
+ *
  *	we have two functions for adding an edge to a list
  *	the first one add unconditionnaly the edge to the
  *	(non full) list...
@@ -88,6 +108,7 @@ list->edges[list->fidx].B = p1;
 list->fidx ++;
 return 0;
 }
+
 /*
  *	and the second only insert an edge if it was missing
  *	from the currently know list.
@@ -114,24 +135,6 @@ if ( ! is_edge_in_list(list, p0, p1) ) {
 return 0;
 }
 /* --------------------------------------------------------------------- */
-/*
- *	with this func, you can search for duplicates
- */
-int is_edge_in_list(EdgeList *list, int p0, int p1)
-{
-int		idx;
-
-for (idx=0; idx < list->fidx; idx++) {
-	if (	(list->edges[idx].A == p0) &&
-		(list->edges[idx].B == p1) )		return 1;
-
-	if (	(list->edges[idx].A == p1) &&
-		(list->edges[idx].B == p0) )		return 2;
-	}
-
-return 0;		/* NOT FOUND */
-}
-/* --------------------------------------------------------------------- */
 int  print_edgelist_desc(EdgeList *list, int k)
 {
 
@@ -147,12 +150,43 @@ fprintf(stderr, "\tsize                %8d\n",      list->size);
 fprintf(stderr, "\tnext free           %8d\n",      list->fidx);
 fprintf(stderr, "\tmagic              0x%08lX\n",   list->magic);
 
+return 0;
+}
+/* --------------------------------------------------------------------- */
+/*
+ *	/!\	the output format is subject to changes in
+ *		a near futur.
+ */
+int  edges_to_data(char *fname, EdgeList *list, int k)
+{
+FILE		*fp;
+int		idx, foo;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( '%s'  %p %d )\n", __func__, fname, list, k);
+#endif
+
+if (NULL==(fp=fopen(fname, "w"))) {
+	perror(fname);
+	return -1;
+	}
+for (idx=0; idx<list->fidx; idx++) {
+	foo = fprintf(fp, "%d %d\n", list->edges[idx].A, list->edges[idx].B);
+	/*
+	 * error check
+	 */
+	if (foo < 0) {
+		perror(fname);
+		exit(1);		/* be violent ! */
+		}
+	}
+fclose(fp);
 return 0;
 }
 /* --------------------------------------------------------------------- */
 int  print_the_edges(FILE *fp, EdgeList *list, int k)
 {
-int		foo;
+int		idx;
 
 #if DEBUG_LEVEL
 fprintf(stderr, ">>> %s ( %p %d )\n", __func__, list, k);
@@ -165,9 +199,9 @@ if (k) {
 
 fprintf(stderr, "    list.fidx = %d\n", list->fidx);
 
-for (foo=0; foo<list->fidx; foo++) {
-	fprintf(fp, "%6d\t\t%5d %5d\n", foo,
-			list->edges[foo].A, list->edges[foo].B);
+for (idx=0; idx<list->fidx; idx++) {
+	fprintf(fp, "%6d\t\t%5d %5d\n", idx,
+			list->edges[idx].A, list->edges[idx].B);
 	}
 
 return -1;
diff --git a/edges.h b/edges.h
index 109a5d3..ea47a50 100644
--- a/edges.h
+++ b/edges.h
@@ -1,13 +1,15 @@
 /*
  *		edges.h
  *	a part of libbubulle from tTh
+ *
+ *		https://git.tetalab.org/tTh/libbubulle
  */
 
 /* --------------------------------------------------------------------- */
 
 typedef struct {
 	int		A, B;
-	short		burz;
+	short		burz;			/* for what usage ??? */
 	} AnEdge;
 
 typedef struct {
@@ -26,9 +28,10 @@ int 		free_edgelist(EdgeList *list, int k);
 int 		push_an_edge(EdgeList *list, int p0, int p1);
 int 		push_a_missing_edge(EdgeList *list, int p0, int p1);
 
-int 		is_edge_in_list(EdgeList *list, int p0, int p1);
+// int 		is_edge_in_list(EdgeList *list, int p0, int p1);
 
 int  		print_edgelist_desc(EdgeList *list, int k);
+int 		edges_to_data(char *fname, EdgeList *list, int k);
 int  		print_the_edges(FILE *file, EdgeList *list, int k);
 
 /* --------------------------------------------------------------------- */