In his simulations, it was extremely rare for someone to have their mutual first picks; but many people had those that were second or third picks. In this scenario a couple counts as happy if each is near the top of the other's list and neither can find someone they and that other person would both prefer more.
And, although it is difficult to find references to knocking wood for good luck before the nineteenth century, it turns out that this is not the case for touching iron — the “tocca ferro” of Italy, shown above.
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