from my mailbox
>>cousin marriages will cause pedigree collapse

Aha! Anesammenfald!
You just have to wait long enough and someone comes up with a word you are looking for.

Re Snorri Sturlison
In denmark we say Snorre Sturlason, but which is right I dont know.
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no time today to google for a consensus of search library catalogues for a consensus

You know Snorri was a genealogist too