>>> from coprimers import crea_graf_coprimers
>>> from ex2 import nodes_menors

>>> c = set(range(2, 10))
>>> g = crea_graf_coprimers(c)
>>> nodes_menors(g, 5) == {2, 3, 4}
True
>>> nodes_menors(g, 8) == {2, 3, 4, 5, 6, 7}
True
>>> nodes_menors(g, 2) == set()
True

----

>>> c = set(range(5, 20))
>>> g = crea_graf_coprimers(c)
>>> nodes_menors(g, 6) == {5}
True
>>> nodes_menors(g, 10) == {8, 9, 5, 6, 7}
True
>>> nodes_menors(g, 15) == {5, 6, 7, 8, 9, 10, 11, 12, 13, 14}
True