diff --git a/test/preflow_graph.lgf b/test/preflow_graph.lgf
--- a/test/preflow_graph.lgf
+++ b/test/preflow_graph.lgf
@@ -1,35 +1,34 @@
 @nodes
-label	
-0	
-1	
-2	
-3	
-4	
-5	
-6	
-7	
-8	
-9	
-@edges
-		label	capacity	
-0	1	0	20	
-0	2	1	0	
-1	1	2	3	
-1	2	3	8	
-1	3	4	8	
-2	5	5	5	
-3	2	6	5	
-3	5	7	5	
-3	6	8	5	
-4	3	9	3	
-5	7	10	3	
-5	6	11	10	
-5	8	12	10	
-6	8	13	8	
-8	9	14	20	
-8	1	15	5	
-9	5	16	5	
-@attributes 
+label
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9
+@arcs
+		label	capacity
+0	1	0	20
+0	2	1	0
+1	1	2	3
+1	2	3	8
+1	3	4	8
+2	5	5	5
+3	2	6	5
+3	5	7	5
+3	6	8	5
+4	3	9	3
+5	7	10	3
+5	6	11	10
+5	8	12	10
+6	8	13	8
+8	9	14	20
+8	1	15	5
+9	5	16	5
+@attributes
 source 1
 target 8
-@end