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December 2021 - Solution
Possible solutions for the riddles are
"RLL<L><<L><RR>><<R>>><<<L>>><<<<R>>>"
"RL><L><<RL<LRL><<<<R>R>>>L>><R<RL>R><<<R<<<<L"
These specific solutions were found by Andreas Stiller and can be visualized by a nice "Christmas tree":
R L L < L > < < L > < R R > > < < R > > > < < < L > > > < < < < R > > > R L > < L > < < R L < L R L > < < < < R > R > > > L > > < R < R L > R > < < < R < < < < LIt was a lucky coincidance that a riddle with such solutions was chosen for December.