Just a bit of pedantry. Trepan has two meanings. the most common usage is to cut a disc out of something, often used in brain surgery, but also to cut a circular shaft, as in mining. The other, more obscure, usage is to set a trap. As entrap is an anagram of trepan, I originaly thought that it was a spelling mistake! There is an obscure Victorian song entitled "It was my cruel parents that first did me trepan". I am never too sure which meaning of the word this refers to, but I hope its the second. Happy hunting. Dave.
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