Hi Dex, just did a google search and found this....

  1. Justis
    60,029 Posts.
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    27/12/16
    19:24
    Post #: 21566801
    Hi Dex, just did a google search and found this.

    http://www.aph.gov.au/About_Parliam...s/Parliamentary_Library/pubs/rp/rp0203/03RP04

    Bit of a long read and I am yet to read it but think we will find an explanation in it
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