easy

早期freebsd实现

update = 7;
newplane = 12;
width = 15;
height = 15;

exit:		(  7  0 x ) ( 14  0 z ) ( 12 14 q ) (  0 14 e ) ;

beacon:		( 12  7 ) ;

airport:	(  7  8 w ) ;

line:		[ (  1  1 ) (  6  6 ) ]
		[ (  7  9 ) ( 12 14 ) ]
		[ (  7  0 ) (  7 14 ) ]
		[ (  1  7 ) ( 11  7 ) ] ;