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when toggle format what by license comment
Sep 11, 2014 at 15:20 comment added Jim Humphreys P.S. "Paul" here refers to Paul Garrett, who gave a concise but helpful partial answer to the question.
Sep 11, 2014 at 14:14 vote accept ronggang
Sep 10, 2014 at 20:48 history edited Jim Humphreys CC BY-SA 3.0
added 1 character in body
Sep 10, 2014 at 18:59 history answered Jim Humphreys CC BY-SA 3.0