>>> from parelles import parelles_consonants

--ini-enunciat

>>> it = iter(['casa', 'parella'])
>>> it2 = parelles_consonants(it)
>>> next(it2)
'cs'
>>> next(it2)
'sp'
>>> next(it2)
'pr'
>>> for x in it2:
...    print(x, end=',')
rl,ll,

>>> for x in parelles_consonants(iter(['pera', 'perer', 'ase', 'aei', 'lloc'])):
...    print(x, end=',')
pr,rp,pr,rr,rs,sl,ll,lc,

--fi-enunciat

>>> it = parelles_consonants(iter(['reves']))
>>> for x in it:
...    print(x, end=',')
rv,vs,
>>> it = parelles_consonants(iter(['aeio', 'oiu']))
>>> for x in it:
...    print(x, end=',')

>>> it = parelles_consonants(iter(['aeios', 'oiu']))
>>> for x in it:
...    print(x, end=',')


>>> for x in parelles_consonants(iter('la casa de noia rossa estava ben buida'.split())):
...    print(x, end=',')
lc,cs,sd,dn,nr,rs,ss,ss,st,tv,vb,bn,nb,bd,