node { background: yellow; }
[ Bonn ] ..> [ Berlin ] -> [ Kassel ]
[ Bonn ] .-> [ Koblenz ]
[ Bonn ] -> [ Ulm ] -> [ Koblenz ]
[ Ulm ] -> [ Bautzen ] -> [ Berlin ]
[ 1Bonn ] ..> [ 1Berlin ] -> [ 1Kassel ]
[ 1Bonn ] .-> [ 1Koblenz ]
[ 1Bonn ] -> [ 1Ulm ] -> [ 1Koblenz ]
[ 1Ulm ] -> [ 1Bautzen ] -> [ 1Berlin ]
[ 2Bonn ] ..> [ 2Berlin ] -> [ 2Kassel ]
[ 2Bonn ] .-> [ 2Koblenz ]
[ 2Bonn ] -> [ 2Ulm ] -> [ 2Koblenz ]
[ 2Ulm ] -> [ 2Bautzen ] -> [ 2Berlin ]