function readOnly(count){ }
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May I suggest you please refer to below links with similar discussions which will help you further.
- https://help.salesforce.com/articleView?id=fields_useful_validation_formulas_contact.htm&type=5
- https://success.salesforce.com/answers?id=9063A000000lAwqQAE
Hope this helps.Kindly mark this as solved if the reply was helpful.
Thanks,
Nagendra