def f(a,p){|([],_)=>Nemerle.IO.print(p+"\n")|_=>a.Iter(x=>f(a.Filter(_!=x),if(p=="")x else p+" "+x))}f(["0","1","2","3","4","5"],"")
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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