parameters: (la, lb)
return_statement: return la
docstring: Add all the elements of lb in la if they are not there already.
docstring_summary: Add all the elements of lb in la if they are not there already.
docstring_tokens: Add all the elements of lb in la if they are not there already .
function: def concatenate_unique(la, lb):
    """Add all the elements of lb in la if they are not there already."""
    for l in lb:
      if l not in la:
        la.append(l)
    return la
function_tokens: def concatenate_unique ( la , lb ) : for l in lb : if l not in la : la . append ( l ) return la