@@ -16,7 +16,7 @@ class Plantri(Executable):
1616 EXAMPLES::
1717
1818 sage: from sage.features.graph_generators import Plantri
19- sage: Plantri().is_present() # optional: plantri
19+ sage: Plantri().is_present() # optional - plantri
2020 FeatureTestResult('plantri', True)
2121 """
2222 def __init__ (self ):
@@ -38,7 +38,7 @@ def is_functional(self):
3838 EXAMPLES::
3939
4040 sage: from sage.features.graph_generators import Plantri
41- sage: Plantri().is_functional() # optional: plantri
41+ sage: Plantri().is_functional() # optional - plantri
4242 FeatureTestResult('plantri', True)
4343 """
4444 command = ["plantri" , "4" ]
@@ -63,7 +63,7 @@ class Buckygen(Executable):
6363 EXAMPLES::
6464
6565 sage: from sage.features.graph_generators import Buckygen
66- sage: Buckygen().is_present() # optional: buckygen
66+ sage: Buckygen().is_present() # optional - buckygen
6767 FeatureTestResult('buckygen', True)
6868 """
6969 def __init__ (self ):
@@ -85,7 +85,7 @@ def is_functional(self):
8585 EXAMPLES::
8686
8787 sage: from sage.features.graph_generators import Buckygen
88- sage: Buckygen().is_functional() # optional: buckygen
88+ sage: Buckygen().is_functional() # optional - buckygen
8989 FeatureTestResult('buckygen', True)
9090 """
9191 command = ["buckygen" , "-d" , "22d" ]
@@ -111,7 +111,7 @@ class Benzene(Executable):
111111 EXAMPLES::
112112
113113 sage: from sage.features.graph_generators import Benzene
114- sage: Benzene().is_present() # optional: benzene
114+ sage: Benzene().is_present() # optional - benzene
115115 FeatureTestResult('benzene', True)
116116 """
117117 def __init__ (self ):
@@ -133,7 +133,7 @@ def is_functional(self):
133133 EXAMPLES::
134134
135135 sage: from sage.features.graph_generators import Benzene
136- sage: Benzene().is_functional() # optional: benzene
136+ sage: Benzene().is_functional() # optional - benzene
137137 FeatureTestResult('benzene', True)
138138 """
139139 devnull = open (os .devnull , 'wb' )
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