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int main() {
print(f1());
}
string f1() {
print(f2());
return "ok 4\n";
}
string f2() {
print(f3());
return "ok 3\n";
}
string f3() {
print(f4());
return "ok 2\n";
}
string f4() {
print("1..4\n");
return "ok 1\n";
}