var 9..36: INT____00001 :: is_defined_var :: var_is_introduced;
array [1..3] of var 0..2: howfull = [2, 1, 0];
var 9..36: sumx :: output_var = INT____00001;
array [1..9] of var 1..4: x :: output_array([1..3, 1..3]);
constraint int_lin_eq([2, 1], [x[1], x[2]], 7);
constraint int_lin_eq([2, 1], [x[4], x[5]], 7);
constraint int_lin_eq([2, 1], [x[7], x[8]], 7);
constraint int_lin_eq([1, 1, 1], [x[1], x[2], x[3]], 7);
constraint int_lin_eq([1, 1, 1], [x[1], x[4], x[7]], 7);
constraint int_lin_eq([1, 1, 1], [x[2], x[5], x[8]], 7);
constraint int_lin_eq([1, 1, 1], [x[3], x[6], x[9]], 7);
constraint int_lin_eq([1, 1, 1], [x[4], x[5], x[6]], 7);
constraint int_lin_eq([1, 1, 1], [x[7], x[8], x[9]], 7);
constraint int_lin_eq([-1, 1, 1, 1, 1, 1, 1, 1, 1, 1], [INT____00001, x[1], x[2], x[3], x[4], x[5], x[6], x[7], x[8], x[9]], 0) :: defines_var(INT____00001);
solve satisfy;