I see no difference between a and b, but both are a little odd, since we are only 10 years into the 21st. I only like d and f, but I like it best with no preposition and no conjunction.
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Mister Micawber both are a little odd
Mister MicawberI like it best with no preposition and no conjunctionSo do I. I just found it interesting and puzzling that 'in is optional.