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SIGNATURE Quadruple [data1,data2,data3,data4]
$Date: 2010-09-30 18:24:17 +0200 (Do, 30. Sep 2010) $ ($Revision: 616 $)
-- quadruple constructor SORT data1 data2 data3 data4 TYPE quad == &( 1st: data1, 2nd: data2, 3rd: data3, 4th: data4 ) FUN unquad: quad -> data1 ** data2 ** data3 ** data4 -- & o unquad == id
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