Update app.py

app.py

@@ -321,7 +321,7 @@ def make_figure(d: int,
     # ---------- neighbors of path vertices without the 2 ends ----------
     neighbor_set = set()
     if mark_distances and path and len(path)>2:
-        for v in in_path[1:-2]:
+        for v in in_path[1:-1]:
             for bit in range(d):
                 u = v ^ (1 << bit)
                 if u not in in_path: