A boy saw some ducklings swimming in a pond. He then created a puzzle for his friends at school showing a duckling swimming in front, behind, and between two other ducklings. The puzzle asked how many ducklings were in the pond.

1. A boy saw some duckling
swimming in the pond.
At school, he gave puzzle
to his friends.

2. A duckling was swimming
in front of two ducklings.

3. A duckling was swimming
behind of two ducklings.

4. A duckling was swimming
between of two ducklings.

5. How many ducklings
in the pond?