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Thanks to Lector and Slaney, I think the whole fiendishness of this question is that it is a matter of personal opinion. Sure, Manet was the older of the two, but was he really the originator of impressionism? Monet picked it up and ran with it, and I think was the better artist, but does that make him the originator? probably not, in which case I have put the wrong answer. I think art historians can argue for ever on this. As you say, we will find out on Saturday!