defining in init.g the four PreImages...NC operations

init.g

@@ -6,6 +6,22 @@
 ##
 #############################################################################
 
+#I introducing globally the NC versions of PreImages...  
+if not IsBound( PreImagesNC ) then 
+    BindGlobal( "PreImagesNC", PreImages ); 
+fi; 
+if not IsBound( PreImagesElmNC ) then 
+    BindGlobal( "PreImagesElmNC", PreImagesElm ); 
+fi; 
+if not IsBound( PreImagesSetNC ) then 
+    BindGlobal( "PreImagesSetNC", PreImagesSet ); 
+fi; 
+if not IsBound( PreImagesRepresentativeNC ) then 
+    BindGlobal( "PreImagesRepresentativeNC", PreImagesRepresentative ); 
+fi; 
+
+#############################################################################
+
 ReadPackage( "rcwa", "lib/rcwamap.gd" );
 ReadPackage( "rcwa", "lib/rcwamono.gd" );
 ReadPackage( "rcwa", "lib/rcwagrp.gd" );