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  1. flatten([X|Xs] ,Ys) :-
  2.     flatten(X,Ys1), flatten(Xs,Ys2), append(Ys1,Ys2,Ys).
  3. flatten(X,[X]) :- atomic(X).
  4. flatten([],[]).
  5.  
  6. :- flatten([[1,2],[3,4],[5,[6,7]],[],[[],8]], X), write(X), nl, fail.
  7.  
Success #stdin #stdout #stderr 0.04s 7872KB
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stdin
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Standard input is empty
stdout
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[1,2,[],3,4,[],5,6,7,[],[],[],[],8,[],[]]
[1,2,[],3,4,[],5,6,7,[],[],[],[],8,[]]
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stderr
copy 
Warning: /home/SuTAba/prog:6:
	Goal (directive) failed: user: (flatten([[1,2],[3,4],[5,[6,7]],[],[[],8]],_G1545),write(_G1545),nl,fail)
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/EFfdQx
language:
Prolog (swi 7.6.4)
created:
9 years ago
visibility:
public

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