Solve the initial-value problem. 
Definitions:
Puberty
A developmental stage during which a child's body matures into an adult body capable of sexual reproduction.
Perineum
The region of the body between the anus and the genitals, present in both males and females.
Peritoneum
A membrane that lines the abdominal cavity and covers most of the abdominal organs, playing a role in their support and protection.
Areola
A ring of darkened skin around the nipple of the breast.
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