diff --git a/src/models/append_graph.rs b/src/models/append_graph.rs
index 4468980..b06971d 100644
--- a/src/models/append_graph.rs
+++ b/src/models/append_graph.rs
@@ -176,9 +176,10 @@ impl GraphTopology for AppendGraph {
     }
 
     fn incident_vertices(&self, e: Self::Edge) -> (Self::Vertex, Self::Vertex) {
-        let v2 = self.incidences[e.0].adjacent;
-        let v1 = self.incidences[e.0 ^ 1].adjacent;
-        (v1, v2)
+        (
+            self.incidences[e.0 ^ 1].adjacent,
+            self.incidences[e.0].adjacent,
+        )
     }
 
     fn edges(&self) -> impl Iterator<Item = Self::Edge> {