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<p>[QUOTE=&quot;LionelR, post: 1690696, member: 23549&quot;]I&#039;m writing software for just this purpose because my existing spreadsheet became too unwieldy.&nbsp; My solution was to use ye olde arithmetic sequential system of 1, 2, 3, .... 9,223,372,036,854,775,807.&nbsp; It isn&#039;t terribly exciting or esoteric but has an upside of being simple. For whatever this post is worth <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p>-L[/QUOTE]</p><p><br /></p>

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