update = 5;
newplane = 5;
width = 30;
height = 21;
exit: ( 12 0 x ) ( 0 6 d ) ( 29 12 a ) ( 26 20 q ) ;
beacon: ( 12 6 ) ;
airport: ( 8 11 x ) ;
line: [ ( 12 1 ) ( 12 5 ) ]
[ ( 1 6 ) ( 11 6 ) ]
[ ( 8 7 ) ( 8 10 ) ]
[ ( 28 12 ) ( 19 12 ) ]
[ ( 13 7 ) ( 25 19 ) ] ;