i say that identical twins are the least rare because like me a fraternal twin i only know 1 pair of fraternal twin.
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Don't know how rare, but as a 38 yr old woman, I unknowingly had mine for eight years and carried twins to full term before anything happened.
That depends on which hole. Shorter holes will have more common hole in ones than long ones. In general, still very rare.
1924 SState quarters are not worth more than face value unless they have the "S" mintmark. Pre-1965 quarters are rare, because they have a high silver content.
Rare by far
Rare only has one syllable.