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@mashton
That looks like the old "have got two freewheels and two chain rings but really want to have a fixed wheel bike" trick. Basically one frewheel will coast forward, the other one coasts backward. Hey presto, you've got a fixie.
I have no idea why you'd want to do this, other than to see if it really works.
I suppose it does mean that the bike is perfectly balanced left to right!