>>> from cims_valls import cims_valls

--ini-enunciat
>>> it1 = iter([1, 3, 4, 7, 6, 8, 9, 10, 11, 10, 9, 7, 12, 10, 8, 6, 4, 5, 6, 7, 11])
>>> it2 = cims_valls(it1)
>>> iter(it2) is it2
True
>>> next(it2)
1
>>> next(it2)
7
>>> next(it2)
6
>>> for p in it2:
...    print(p)
11
7
12
4
11

--fi-enunciat
>>> it3 = iter([12, 13, 14, 10, 9, 8, 4, 2, 6, 5, 3])
>>> it4 = cims_valls(it3)
>>> iter(it4) is it4
True
>>> next(it4)
12
>>> next(it4)
14
>>> next(it4)
2
>>> next(it4)
6
>>> next(it4)
3
>>> next(it4)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration
>>> it5 = iter([3, 4, 6, 5, 4, 3, 2, 4, 6, 8, 12, 11, 10, 9, 12, 14])
>>> it6 = cims_valls(it5)
>>> iter(it6) is it6
True
>>> list(it6)
[3, 6, 2, 12, 9, 14]
>>> it7 = iter([1, 3, 1, 3, 1, 3, 1, 3])
>>> it8 = cims_valls(it7)
>>> if iter(it8) is not it8:
...     print(it8, "no és un iterador")
>>> list(it8)
[1, 3, 1, 3, 1, 3, 1, 3]