origin = ( 2,1.75 )
	cht = 0.08; cwid = cht*0.75

	arrow 'source' 'code' 
LA: 	box 'lexical' 'analyser' 
	arrow 'tokens' 
P: 	box 'parser' 
	arrow 'inter-' 'mediate' 'code' 
Sem: 	box 'semantic' 'checker' 
	arrow

	arrow <-> up from top of LA 
LC: 	box color red 'lexical' 'corrector' 
	arrow <-> up from top of P 
Syn: 	box color red 'syntactic' 'corrector' 
	arrow up 
DMP: 	box color blue 'diagnostic' 'message' 'printer' 
	arrow <-> right from east of DMP 
ST: 	box color blue 'symbol' 'table' 
	arrow from LC.ne to DMP.sw 
	arrow from Sem.nw to DMP.se 
	arrow <-> from Sem.top to ST.bottom