#rhythm_method_of_birth_control__rhythm_method__rhythm__calendar_method_of_birth_control__calendar_method  natural family planning in which ovulation is assumed to occur 14 days before the onset of a period (the fertile period would be assumed to extend from day 10 through day 18 of her cycle)
  supertype:  natural_family_planning  any of several methods of family planning that do not involve sterilization or contraceptive devices or drugs; coitus is avoided during the fertile time of a woman's menstrual cycle
     supertype:  birth_control__birthcontrol__birth_prevention__birthprevention__family_planning  limiting the number of children born
        supertype:  planning  an act of formulating a program for a definite course of action; "the planning was more fun than the trip itself"
           supertype:  readying__preparation  the activity of preparing
              supertype:  activity  any specific activity or pursuit; "they avoided all recreational activity"
                 supertype:  human_action__humanaction__act__human_activity__humanactivity  something that people do or cause to happen
                    supertype:  process__proces  situation commonly considered as making a change during some period of time
                       supertype:  situation  something that "occurs" in a real/imaginary region of time and space
                          supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                       supertype:  process_or_process_description
                          supertype:  processing_thing
                             supertype:  thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                                supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                    supertype:  process__proces__physicalsituation  intuitively, the class of things that happen and have temporal parts or stages; examples include extended events like a football match or a race, actions like pursuing and reading, and biological processes; sumo#process is not identical to pm#situation because an instance of pm#situation is not necessarily an instance of sumo#physical
                       supertype:  situation  something that "occurs" in a real/imaginary region of time and space
                       supertype:  process_or_process_description
                       supertype:  physical__physical_thing  an entity that has a location in space-time; locations are themselves understood to have a location in space-time; click here for more details on the identical category sowa#physical_thing
                          supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

No statement uses or specializes rhythm_method_of_birth_control; click here to add one.