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Didn't the rules say arbitrary list? Try this with the list (1,2,3,1) and you get incorrect output.

However here is another 57 char solution that does not suffer from this deficiency.

sub p{ @_?map{my$x=shift;@r=map[$x,@$_],&p;push@_,$x;@r}1..@_:[] }

In reply to Re (tilly) 2: (Golf) Per Mutations by tilly
in thread (Golf) Per Mutations by MeowChow

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