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Feb 16, 2012 at 1:52 history edited David E Speyer CC BY-SA 3.0
edited body
Feb 15, 2012 at 20:50 history edited David E Speyer CC BY-SA 3.0
added 1788 characters in body
Feb 15, 2012 at 16:12 comment added Xavier49 I will study that.Thanks a lot David.
Feb 15, 2012 at 16:03 vote accept Xavier49
Feb 15, 2012 at 15:21 history edited David E Speyer CC BY-SA 3.0
added 1050 characters in body
Feb 15, 2012 at 15:09 history answered David E Speyer CC BY-SA 3.0