Waiting Period of a Woman whose Hayd (menses) is Confused

10. Muhammad has narrated from Ahmad from Ali ibn al-Hakam from Musa ibn Bakr from Zurarah who has said the following: “He (the Imam) عليه السلام, has said, ‘If she waits and does not find the Hayd (menses)-free period except three months then if her Hayd (menses) is not straight. If she experiences Hayd in a month several times such woman’s waiting period is like the waiting period of one who experiences Istihadah, whose ‘Iddah (waiting period) is three months. If she experiences Hayd straightly, thus, in every month is one Hayd and between two Hayd (menses) one month of time it is the Hayd-free period.’”