help with “over th” vs “under th”

Is there a default for “under th”? I got stuck reading [ten o] which was intended as “to know.”

In the process I realized unless there’s a preference for “though” using the under version (which is the way it is in the dictionary) it would be indistinguishable from “to know” and I haven’t been able to find a rule in the books about this though I suspect one is there.

In other words is it incorrect to write “though” using the ‘over’ version..which also makes it look just like “to know”?

 


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