Origin of Russian Free Accent

Hey everyone!

I've been working on a new conlang in addition to Thalassan (which I plan
to submit a grammar sketch to this list and Langmaker soon).  It has a
free-accent system similar to Russian's.  Since Russian is (so far) the
primary basis for this language's accentuation, I'm curious to know the
origin of its free accent.  Can anyone help me here? :)

Thanks,
Rob

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