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area[admin_level=8][name="Quimper"];
way[highway][junction=roundabout](area) -> .all;
make counter num = 0 -> .count;
foreach.all {
  if (! lrs_in(u(id()), visited_ids.set(t['ids'])))
  {
    complete {
      node(w);
      way.all(bn);
    }
    make visited
      ids = lrs_union(set(id()), visited_ids.set(t['ids']))
      -> .visited_ids;
    .count convert counter num = t['num'] + 1 -> .count;
  }
}
.count out;
 
10 km
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