6 exit: ( 0 10 d ) ( 6 0 x )
9 ( 24 20 w ) ( 18 20 w )
10 ( 12 20 w ) ( 6 20 w ) ;
12 beacon: ( 6 10 ) ( 12 10 ) ( 18 10 ) ( 24 10 )
13 ( 6 5 ) ( 12 5 ) ( 18 5 ) ( 24 5 )
16 airport: ( 9 15 a ) ( 21 15 d ) ( 15 5 d ) ;
18 line: [ ( 6 1 ) ( 6 4 ) ]
26 [ ( 12 11 ) ( 12 14 ) ]
27 [ ( 18 11 ) ( 18 14 ) ]
29 [ ( 24 11 ) ( 24 19 ) ]
30 [ ( 12 16 ) ( 12 19 ) ]
31 [ ( 18 16 ) ( 18 19 ) ]
34 [ ( 13 15 ) ( 17 15 ) ]
36 [ ( 7 10 ) ( 11 10 ) ]
37 [ ( 13 10 ) ( 17 10 ) ]
38 [ ( 19 10 ) ( 23 10 ) ]
39 [ ( 25 10 ) ( 29 10 ) ] ;