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dekker.one
1var 1..2: x:: output_var;
2var set of 1..10: y:: output_var;
3var bool: X_INTRODUCED_20_ ::var_is_introduced :: is_defined_var;
4constraint set_in_reif(x,y,X_INTRODUCED_20_):: defines_var(X_INTRODUCED_20_);
5constraint set_in_reif(2,y,false);
6constraint set_in_reif(4,y,false);
7constraint set_in_reif(6,y,false);
8constraint set_in_reif(8,y,false);
9constraint set_in_reif(10,y,false);
10constraint int_le_reif(5,x,X_INTRODUCED_20_);
11solve satisfy;