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t/simplify-empty.yy
 
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query:
 
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        gp1 | gp2 ;
 
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gp1:
 
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        p1 | p2 | ;
 
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gp2:
 
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        p1 | p2 ;
 
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p1:
 
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        c1 | c2 ;
 
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p2:
 
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        c1 | c2 ;
 
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c1:
 
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        A | B ;
 
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c2:     A | B ;