Twelve statements: Difference between revisions

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m →‎{{header|Prolog}}: Simplification of the code
→‎{{header|Prolog}}: mistake at condition 7
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% 7. Either statement 2 or 3 is true, but not both.
A7 #<==> A2 #\/+ A3 #= 1,
 
% 8. If statement 7 is true, then 5 and 6 are both true.