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append([],Y,Y).
append([W|X],Y,[W|Z]):- append(X,Y,Z).
reverse([],[]).
reverse([W|X],Y):- reverse(X,Xr),append(Xr,[W],Y).
 
 

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• # 3:   hide show   clone   input   119 days 14 hours ago    Success

  result: Success     time: 0.03s    memory: 6204 kB     returned value: 0

  input:

  ?- reverse(X,[a,b,c]).

  output: no
  stderr:

  ERROR: toplevel: Undefined procedure: (?-)/1 (DWIM could not correct goal)
  
  

• # 2:   hide show   clone   input   119 days 14 hours ago    Success

  result: Success     time: 0.03s    memory: 6204 kB     returned value: 0

  input:

  | ?- reverse(X,[a,b,c]).

  output: no
  stderr:

  ERROR: Syntax error: Operator expected
  ERROR: | 
  ERROR: ** here **
  ERROR: ?- reverse(X,[a,b,c]) . 
  
  

• # 1:   hide show   clone   input   119 days 14 hours ago    Success

  result: Success     time: 0.02s    memory: 6204 kB     returned value: 0

  input: no
  output: no
  stderr: