A calendar of the month of September marked as a natural family planning method. X's mark menstrual flow. O's mark days of abstinence. Colored square marks day of peak mucus. Unmarked days are those safe for coitus. Drawing

A calendar of the month of September marked as a natural family planning method. X's mark menstrual flow. O's mark days of abstinence. Colored square marks day of peak mucus. Unmarked days are those safe for coitus.

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