var 1..2: x:: output_var;
var set of 1..10: y:: output_var;
constraint set_in_reif(2,y,false);
constraint bool_not(false,true);
constraint set_in_reif(4,y,false);
constraint set_in_reif(6,y,false);
constraint set_in_reif(8,y,false);
constraint set_in_reif(10,y,false);
constraint set_in_reif(x,y,false);
solve  satisfy;