1. First we make a hole at the bottom of the 2 cups.
2. Second we put the string.
3. Third tie both strings make it really tied so it will not be loosen.
4. Fourth, talk to the prson at the other side make sure the line is straight so the sound can travel.
Conclusion:
The yarn is the medium and the cup is the source of the sound. the sound travels through the string.
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