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Peters first visit
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Peter visits a page -> web server calls get_or_create_test_version(<paulsid>,'EtoS',['green','blue']);<p>

New User? [small picture of file cabinet with a arrow pointing to a '?'] YES.
[small picture of a dice or coin toss] -> random choice of 'green' or 'blue'. Let's say 'green'. ->
[picture of string 'peter has green' with arrow to file cabinet ]. 

$version='green'

[ small picture of a green cube which looks like a webpage ]

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Peters next visits
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Peter visits a page --> web server calls get_or_create_test_version(<paulsid>,'EtoS',['green','blue']);

New User? [picture of file cabinet with an arrow to string "peter has green"] NO.

$version = 'green'

[ small picture of a green cube which looks like a webpage ]
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