>>> from artropode import Artropode
>>> from aracnid import Aracnid, possibles_aracnids

>>> a1 = Aracnid('Latrodectus tredecimguttatus', 'Viuda negra')
>>> a1['ullals'] = 2
>>> a1['pedipalps'] = 2
>>> a2 = Aracnid('Belisarius xambeui', 'Escorpi cec')
>>> a2['pinces'] = 2
>>> a2['quelicers'] = 2
>>> a2['fiblons'] = 1
>>> a3 = Artropode('Drosophila melanogaster', 'Mosca del vinagre', 3)
>>> a3['ales'] = 2
>>> a3['potes'] = 6
>>> a4 = Artropode('Homarus gammarus', 'Llamantol', 2)
>>> a4['pinces'] = 2
>>> a4['potes'] = 8
>>> a4['antenes'] = 4
>>> possibles_aracnids([a1, a3, a2, a4]) == [a1, a2]
True