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address along GSR seem to restart every so often. Here it goes from 797 back to 1...

So apparently there are 5 places along this road with the same address of '21 Great South Road':

https://osm.org/node/5421574797
https://osm.org/node/5485877698
https://osm.org/node/5487673198
https://osm.org/node/5596123191
https://osm.org/node/1593491