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It is indeed. Surely you're up to the task, Blogger.
God does not live within the confines of our logic. By those standards one would say:
1)Prior to modern medical technology, all pregnant women were non-virgins
2)Mary was a pregnant woman
3)Therefore, she was not a virgin
You are dealing with the supernatural, not the natural. It doesn't fit into the nice neat little package A8 is trying to make it fit into.