in other words, the same result would come from:
(not 0) AND 0 = 0
(not 0) AND 1 = 1
(not 1) AND 0 = 0
(not 1) AND 1 = 0
or even:
1 AND 0 = 0
1 AND 1 = 1
0 AND 0 = 0
0 AND 1 = 0
in other words, the sample wasn't perfect 
ruud, when you fix this not operand?
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