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SIGNATURE Union2[data1: SORT, data2: SORT]
$Date: 2010-09-30 18:24:17 +0200 (Do, 30. Sep 2010) $ ($Revision: 616 $)
-- disjoint union of two types
-- Parameter
SORT data1 data2
TYPE union == data1(cont1: data1)
data2(cont2: data2)
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