>>> import networkx as nx

# Creem el graf de l'exemple

>>> g = nx.Graph()
>>> g.add_nodes_from(['Besnac', 'Ashari', 'Samari', 'Krko',
...                   'Grenola', 'Filite', 'Miland', 'Loweh'])
>>> g.add_edges_from([ ('Besnac', 'Ashari'), ('Ashari','Samari'),
...                    ('Besnac', 'Krko'), ('Besnac', 'Grenola'),
...                    ('Grenola', 'Ashari'), ('Grenola', 'Samari'),
...                    ('Grenola', 'Krko'), ('Grenola', 'Miland'),
...                    ('Samari', 'Miland'), ('Miland', 'Loweh') ])

>>> from mapes import fusiona_zones

>>> fusiona_zones(g, 'Ashari', 'Samari', 'Ashamari')
>>> sorted(g.nodes())
['Ashamari', 'Besnac', 'Filite', 'Grenola', 'Krko', 'Loweh', 'Miland']
>>> sorted(g['Ashamari'])
['Besnac', 'Grenola', 'Miland']
>>> sorted( (sorted(e) for e in g.edges()) ) # Arestes del graf
[['Ashamari', 'Besnac'], ['Ashamari', 'Grenola'], ['Ashamari', 'Miland'], ['Besnac', 'Grenola'], ['Besnac', 'Krko'], ['Grenola', 'Krko'], ['Grenola', 'Miland'], ['Loweh', 'Miland']]

>>> fusiona_zones(g, 'Loweh', 'Filite', 'Flowite')
>>> sorted(g.nodes())
['Ashamari', 'Besnac', 'Flowite', 'Grenola', 'Krko', 'Miland']
>>> sorted(g['Ashamari'])
['Besnac', 'Grenola', 'Miland']
>>> sorted( (sorted(e) for e in g.edges()) )
[['Ashamari', 'Besnac'], ['Ashamari', 'Grenola'], ['Ashamari', 'Miland'], ['Besnac', 'Grenola'], ['Besnac', 'Krko'], ['Flowite', 'Miland'], ['Grenola', 'Krko'], ['Grenola', 'Miland']]

>>> fusiona_zones(g, 'Besnac', 'Miland', 'Besland')
>>> sorted(g.nodes())
['Ashamari', 'Besland', 'Flowite', 'Grenola', 'Krko']
>>> sorted(g['Besland'])
['Ashamari', 'Flowite', 'Grenola', 'Krko']
>>> sorted( (sorted(e) for e in g.edges()) )
[['Ashamari', 'Besland'], ['Ashamari', 'Grenola'], ['Besland', 'Flowite'], ['Besland', 'Grenola'], ['Besland', 'Krko'], ['Grenola', 'Krko']]