graph_list: fix a few typos

graph_list.py

@@ -5,7 +5,7 @@ def cube_4y():
   """The 2 nonisomorphic subdivisions of cube which are Z_4- but not
   Z_2^2-connected.
 
-  There is no subdivison of cube with the group connectivity the other way
+  There is no subdivison of the cube with the group connectivity the other way
   around.
   """
 
@@ -17,7 +17,7 @@ def cube_4y():
 def graphs10_4y():
   """List graphs which are Z_4- but not Z_2^2-connected.
 
-  It contains 35 nonisomorphic graphs on 15 verices (3-fold
+  It contains 35 nonisomorphic graphs on 13 vertices (3-fold
   subdivisons of 10-vertex cubic graphs) encoded as graph6
   strings.
   """
@@ -37,7 +37,7 @@ def graphs10_4y():
 def graphs12_4n():
   """List graphs which are Z_2^2- but not Z_4-connected.
 
-  It contains 7 nonisomorphic graphs on 15 verices (3-fold
+  It contains 7 nonisomorphic graphs on 15 vertices (3-fold
   subdivisons of 12-vertex cubic graphs) encoded as graph6
   strings.
   """
@@ -56,7 +56,7 @@ def graphs12_4n():
 def graphs12_4y():
   """List graphs which are Z_4- but not Z_2^2-connected.
 
-  It contains 619 nonisomorphic graphs on 15 verices (3-fold
+  It contains 619 nonisomorphic graphs on 15 vertices (3-fold
   subdivisons of 12-vertex cubic graphs) encoded as graph6
   strings.
   """