5 party:
--------- 
5 sources. 
Each source 1000,000 entities.
There is one file per source, so totally 5 files
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10 party:
---------- 
10 sources. 
Each source 1000,000 entities.
There is one file per source, so totally 10 files
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Fileds:
---------- 
recId: entites with the same recId refer to the same entity.
givenname: 
surname: 
post code: 
suburb: