In math class, I calculated the square of 5.

I visited Nijo Castle.

How much does this value become when squared?

He used to be the village's magistrate.

I remember making and playing with a bamboo-copter when I was a child.

I found a yellow darter in the park.

It is important for each person to fulfill their role.

The Calopteryx cornelia is a species endemic to Japan, and it has beautiful wings.

The children were playing in the park, flying bamboo-copters.

When I was a child, I often made and played with bamboo-copters.