>>> from infsup import infsup

--ini-enunciat
>>> it1 = iter([200, 300, 300, 100, 110, 900])
>>> it2, it3 = infsup(it1, 100)
>>> list(it2)
[]
>>> list(it3)
[200, 300, 300, 100, 110, 900]

>>> it1 = iter([200, 300, 300, 100, 110, 900])
>>> it2, it3 = infsup(it1, 300)
>>> list(it2)
[100, 200, 190]
>>> list(it3)
[300, 300, 900]

--fi-enunciat
>>> it2, it3 = infsup(iter([900, 1500, 200]), 1000)
>>> next(it2)
100
>>> next(it2)
800
>>> next(it2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration
>>> next(it3)
1500
>>> next(it3)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration

--fi enunciat-
>>> it2, it3 = infsup(iter([900, 500, 1000, 700, 1200, 1240]), 899)
>>> list(it2)
[399, 199]
>>> list(it3)
[900, 1000, 1200, 1240]
>>> it1 = iter([200, 300, 300, 850, 1056, 1040, 1067, 900, 500, 200, 1000, 1200, 950, 1000, 980, 1050, 1000])
>>> it2, it3 = infsup(it1, 1000)
>>> list(it2)
[800, 700, 700, 150, 100, 500, 800, 50, 20]
>>> list(it3)
[1056, 1040, 1067, 1000, 1200, 1000, 1050, 1000]
>>> it1 = iter([200, 300, 300, 850, 1056, 1040, 1067, 900, 500, 200, 1000, 1200, 950, 1000, 980, 1050, 1000])
>>> it2, it3 = infsup(it1, 500)
>>> list(it2)
[300, 200, 200, 300]
>>> list(it3)
[850, 1056, 1040, 1067, 900, 500, 1000, 1200, 950, 1000, 980, 1050, 1000]
>>> it1 = iter([200, 300, 300, 100, 110, 900, 10])
>>> it2, it3 = infsup(it1, 100)
>>> list(it2)
[90]
>>> list(it3)
[200, 300, 300, 100, 110, 900]
>>> it1 = iter([200, 300, 300, 100, 110, 900])
>>> it2, it3 = infsup(it1, 2000)
>>> list(it2)
[1800, 1700, 1700, 1900, 1890, 1100]
>>> list(it3)
[]