~drizzle-trunk/drizzle/development

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query:
	gp1 | gp2 ;

gp1:
	p1 | p2 | ;

gp2:
	p1 | p2 ;

p1:
	c1 | c2 ;

p2:
	c1 | c2 ;

c1:
	A | B ;

c2:	A | B ;