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Subject: Human Resources

Dear Hiring Manager,

Thank you for your letter of March 16.

  After careful consideration, I regret to inform you that I am unable to accept your refusal to offer me a position in your department. This year I have been particularly fortunate in receiving an unusually large number of rejection letters. With such a varied and promising field of candidates,
it is impossible for me to accept all refusals.
  Despite your companies' outstanding qualifications and previous experience in rejecting applicants, I find that your rejection does not meet my needs at this time. Therefore, I will assume the position in your department this August. I look forward to seeing you then.

Best of luck in rejecting future applicants.

Sincerely,
Interviewee