Unit Definition (alen [Swedish]) The Swedish Alen is slightly shorter than the Scandinavian Alen. It is almost equal to 2 foot, or more precisely equal to 59.38 centimeters (23.38 inches).
Unit Definition (twain) The twain is an old word for the number two, derived from the Anglo-Saxon twegen. The American author Samuel Clemens (1835-1910), who had been a riverboat pilot on the Mississippi in his youth, took his literary name from a traditional riverboat phrase "mark twain", meaning "exactly two" fathoms of water. This was the minimum depth needed for the boats to operate safely without running aground.
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Length/Distance 
Convert from alen [Swedish] to twain
