A group of 11 smiling kids and young teens are divided into two groups , in a large , indoor swimming pool , with the back person in each group holding their arms up .
It is almost certain that a group of people swim indoors in two teams .
It is almost certain that a group of people swim indoors in two teams .
Chances are about even that a group of people swim indoors in two teams .
A group of people swim indoors in two teams .