>>> from perfumes import buy2

>>> d = {'EAU_TOILETTE': [['Rochis1',78], ['Rochis2',42]],
...   'EAU_PARFUM': [['Challenge',82]], 'EAU_COLOGNE': [['Gege',43]]}
>>> buy2(d, 50)
['Gege', 'Rochis2']
>>> buy2(d,25)
[]