# six nodes, possible to do without a bend

 [ Oranienburg ] -> [ Henningsdorf ]
 [ Oranienburg ] -> [ Herzberg ]
 [ Henningsdorf ] -> [ Strausberg ]
 [ Strausberg ] -> [ Herzberg ]
 [ Strausberg ] -> [ Neuruppin ]
 [ Oranienburg ] -> [ Postdam ]