Demand for physiological period recording: women often have situations of irregular menstrual time, inability to remember menstrual period, and embarrassment due to the sudden onset of menstrual period. Menstrual period is more regular without special management, and natural optimists do not pay much attention to the management of menstrual period. At this time, an app is needed to record the duration of menstruation and predict the duration of menstruation.<br>
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