node.city { color: brown; }
[ Bonn ], [ Berlin ], [ Kassel ] { class: city; }
[ Bonn ] -> [ Berlin ]
[ Kassel ] -> [ Berlin ]
node.city { color: brown; }
[ Bonn ], [ Berlin ], [ Kassel ] { class: city; }
[ Bonn ] -> [ Berlin ]
[ Kassel ] -> [ Berlin ]