[ Berlin ] { border: dashed; }
[ Bonn ] { border: dashed; }
[ Frankfurt ] { border: dot-dot-dash; }
[ Frankfurt (Oder) ] { border: dot-dot-dash; }

[ Berlin ] -- test --> [ Frankfurt ]
[ Berlin ] -- test --> [ Frankfurt (Oder) ]
[ Bonn ] -- test --> [ Frankfurt ]
[ Bonn ] -- test --> [ Frankfurt (Oder) ]