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// expect: 12/
include rt;
int trace;
int step(int v) { trace = trace * 10 + v; return v; }
void pn(int x) { rt.put_n(x); rt.put_c(10); }
fn main() {
int r = step(1) - step(2) * 1;
pn(trace);
return 0;
}
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