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https://www.crosswordclues.com/clue/extremis

`Extremis` received mostly positive reviews, and is often listed as one of the best Iron Man stories. Elements of `Extremis` were adapted for the 2008 film Iron Man and the Iron Man: Armored Adventures episode `Extremis`, and it serves as the primary source material for the 2013 film Iron Man 3. ==Production== `Extremis` was the second sto...
Found on
http://en.wikipedia.org/wiki/Extremis

(also known as in extremis) the point under International Rules of the Road (Navigation Rules) at which the privileged (or stand-on) vessel on collision course with a burdened (or give-way) vessel determines it must maneuver to avoid a collision. Prior to extremis, the privileged vessel must maintain course and speed and the burdened vessel mus...
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http://www.translationdirectory.com/glossaries/glossary101.htm
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