What is the Experimental Participation SignUp system mentioned in the information?
The Experimental Participation SignUp system, known as SONA, is referenced in the information.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the Experimental Participation SignUp system mentioned in the information?

### Input: Not applicable

### Response:
The Experimental Participation SignUp system, known as SONA, is referenced in the information.<|im_end|>