An Example of Tuhr and Haidh and of Tuhr and Istihaadhah

1. A woman experienced 3 days and 3 nights of bleeding followed by 15 clean days. Then she had 3 days and nights of bleeding. Her haidh is the former 3 days and latter 3 days. The 15 clean days in between were of tuhr.
2. If a day or two of bleeding occurred followed by 15 clean days, then another day or two of bleeding, the 15 days are of tuhr and the day or two of bleeding at the beginning and end (of this tuhr) are not haidh, rather these are istihaadhah.

(Behshti Zewar)