Supervisor

I am recently invited by another department to give a talk for a postgraduate course. Soon after I accept invitation, a remarkable email arrives:

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Dear Professor,

Could you please send me the name of your supervisor for your outside practice application.

Yours Sincerely, et cetera.

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(I cannot resist the temptation of replying that and there. Here you go.)

Sir,

I'm afraid I am too old to enjoy the privilege of having a supervisor. My outside practice is endorsed by our department chairman.

CCS