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'Wrong hexadecimal symbol used in top academic computer'
I have P-O-E-S-R presumably Processor ( computer) with some reference to Professor (top academic) but can someone parse the rest of it for me ?

The letters A to F are used in hexadecimal to represent 10-15.

If you replace the "F" in professor with another hex symbol ("C") you get processor.

Swap the F in Professor, top academic, for a C (hexadecimal symbol)?

Well thank you both for that very technical answer. How come nobody else seems to have had a problem with this one?

Well I certainly did.