var a := True;
var b := False;
Print('a = ');
PrintLn(a);
Print('b = ');
PrintLn(b);
Print('a AND b: ');
PrintLn(a AND b);
Print('a OR b: ');
PrintLn(a OR b);
Print('NOT a: ');
PrintLn(NOT a);
Print('a XOR b: ');
PrintLn(a XOR b);