Writing with chalk on a blackboard in different versions.

1. Writing on Chalkboard – 0:01

2. Writing on Chalkboard – 0:01

3. Writing on Chalkboard – 0:03

4. Writing on Chalkboard – 0:01

5. Writing on Chalkboard – 0:02

6. Writing on Chalkboard – 0:02

7. Writing on Chalkboard – 0:04