6 exit: ( 0 0 c ) ( 14 0 x ) ( 28 0 z )
8 ( 28 20 q ) ( 14 20 w ) ( 0 20 e )
11 beacon: ( 4 4 ) ( 14 4 ) ( 24 4 )
13 ( 24 16 ) ( 14 16 ) ( 4 16 )
17 airport: ( 9 7 a ) ( 19 7 d )
18 ( 19 13 d ) ( 9 13 a ) ;
20 line: [ ( 1 1 ) ( 3 3 ) ]
32 [ ( 5 10 ) ( 23 10 ) ]
33 [ ( 25 10 ) ( 27 10 ) ]
35 [ ( 14 11 ) ( 14 12 ) ]
36 [ ( 24 11 ) ( 24 15 ) ]
37 [ ( 10 13 ) ( 13 13 ) ]
38 [ ( 15 13 ) ( 18 13 ) ]
39 [ ( 14 14 ) ( 14 15 ) ]
40 [ ( 5 16 ) ( 13 16 ) ]
41 [ ( 15 16 ) ( 23 16 ) ]
43 [ ( 14 17 ) ( 14 19 ) ]
44 [ ( 25 17 ) ( 27 19 ) ] ;