2 "α" [ class=hypothetical ];
3 "γ" [ class=hypothetical ];
4 "δ" [ class=hypothetical ];
5 2 [ class=hypothetical,label="*" ];
6 3 [ class=hypothetical,label="*" ];
7 4 [ class=hypothetical,label="*" ];
8 5 [ class=hypothetical,label="*" ];
9 7 [ class=hypothetical,label="*" ];