Assertion: period | /r/CapableOf | take place
Facets:
value: a month
type: TEMPORAL
Source sentences:
text: In case the pregnancy does not occur, the progesterone levels decrease, and then menstruation takes place.
text: Although it is normal to say that menstruation takes place once "a month", but it should be clarified that menstrual cycles take place every 28 days ‑ so, in the present context "a month" means a period of 28 days, not 29, 30 or 31 days.