id = 123
group = 'sorting'
number = 30
visible = True
facts = None

solution = '''\
sins123(X, [], [X]).
sins123(X, [Y|T], [X,Y|T]) :-
  X =< Y.
sins123(X, [Y|T], [Y|L]) :-
  X > Y,
  sins123(X, T, L).
isort([], []).
isort([H|T], SL) :-
  isort(T, ST),
  sins123(H, ST, SL).
'''