Confirmation appointment letter format for factory workers who are working for the last 12 years?

Hi, I need urgent help Please provide me the confirmation appointment letter format for factory workers who are working for the last 12 years.

Your query is not clear.
Please provide details. Were the factory workers working for the last 12 years as
temporary workers?
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Please provide me the confirmation appointment letter for factory workers who are working from last 12 years as permanent workers, ESI & PF both are deducting from the first day.