bunch of different notes exactly at the same position, closing them as not usable

[http://osm.org/note/3147885 3147885]  [http://osm.org/note/3228063 3228063]  [http://osm.org/note/3228624 3228624]  [http://osm.org/note/3230794 3230794]  [http://osm.org/note/3231024 3231024]  [http://osm.org/note/3244178 3244178]  [http://osm.org/note/3244194 3244194]  [http://osm.org/note/3252021 3252021]  [http://osm.org/note/3266846 3266846]  [http://osm.org/note/3281135 3281135]  [http://osm.org/note/3281728 3281728]  [http://osm.org/note/3286931 3286931]  [http://osm.org/note/3293386 3293386]  [http://osm.org/note/3308475 3308475]  [http://osm.org/note/3343049 3343049]  [http://osm.org/note/3375836 3375836]  [http://osm.org/note/3392105 3392105]  [http://osm.org/note/3509831 3509831] 