6. Nasiya

499. Nasiya is a woman who has forgotten her habits. If she sees blood for more than ten days, she must choose the days which bear the signs of Hayz until tend days as Hayz period and the rest as Istihaza. And if she cannot identify Hayz form the signs, as an obligatory precaution, she must choose the first 7 days as Hayz period and the rest as Istihaza.