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ostream &print(ostream &os, const QueryResult &qr)
{
os << qr.sought << " occurs " << (qr.lines)->size() << " time(s)" << endl;
for (auto num : *(qr.lines))
os << " (line " << num+1 << ") " << *(qr.file->begin()+num) << endl;
return os;
}