b. I read books for learning's sake not for fun.
c. I read books for the sake of learning not for fun.anonymous a. I read books for learning — not for fun. b.
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anonymous a. I read books for learning — not for fun.b. I read books for learning's sake — not for fun
c. I read books for the sake of learning — not for fun.
I've added a dash to make them grammatical.