use std::io;
extern crate sat;
fn main() {
let mut i = sat::Instance::new();
let x = i.fresh_var();
let y = i.fresh_var();
i.assert_any(&[x, y]);
i.assert_any(&[!x, !y]);
let s = sat::solver::dimacs::Dimacs::new(|| panic!());
s.write_instance(&mut io::stdout(), &i);
}