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my @l= (0..25);
sub c{0==$_[0]%3}
sub S{my($c,$l,@r)=@_;@$l=grep&$c($_)?!push@r,$_:1,@$l;@r}
...
Output:
@r=(0 3 6 9 12 15 18 21 24)
@l=(1 2 4 5 7 8 10 11 13 14 16 17 19 20 22 23 25)