One to read, one to write, and one to keep an eye on the two intellectuals.
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One of them can read, and one of them can write. The third one is there to keep an eye on the two intellectuals.
A. "One can read, one can write and one to keep an eye on the two intellectuals."
The first knows how to read the second knows how to write and the third is to keep an eye on the two intellectuals.
A: One to read one to write and the other one to keep an eye on both intellectuals.