module FFaker::IdentificationMX
def rfc_persona_fisica
http://es.wikipedia.org/wiki/Registro_Federal_de_Contribuyentes_(M%C3%A9xico)
def rfc_persona_fisica consonants_n = CONSONANTS + ['Ñ'] all_letters = consonants_n + VOWELS date = ::Time.at(rand * ::Time.now.to_f).strftime('%y%m%d') [ fetch_sample(consonants_n), fetch_sample(VOWELS), fetch_sample(all_letters, count: 2).join, date, fetch_sample(HOMOCLAVE, count: 3).join ].join end