id = 113
group = 'lists'
number = 20
visible = True
facts = None

solution = '''\
conc113([], L, L).
conc113([H|T], L2, [H|L]) :-
  conc113(T, L2, L).
shiftleft([H|T], L2) :-
  conc113(T, [H], L2).
'''