Eliminate the parameter to find a Cartesian equation of the curve. 
Definitions:
Cervical Progression
The process of the cervix dilating and effacing (thinning) during labor, necessary for vaginal delivery.
Fetal Presentation
The position a fetus is in at the time of delivery, determined by the part of the fetus closest to the birth canal.
Stage 3
A categorization in various models that typically represents a moderate level of development, severity, or progression in a process or disease.
Delivery Placenta
The stage of childbirth where the placenta, the organ that nourished the baby in the womb, is expelled from the uterus after the baby is born.
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