Well, I'm going to say, without looking behind the LJ-cut first, that she should take a pebble out but keep it inside her closed fist so that no one can see it. Then she should insist that the other pebble be taken out of the bag without actually showing hers. When the black pebble comes out, she'll say, "If that's the black pebble, then it must follow that I have the white pebble in my hand."
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And now I'm going to see what you said.
*looks*
Close enough :)
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