leo-project/notes — pull request #13 by egisatoshi (2014-07-08 03:52:13+00:00)
Title: Revise

Because, since, asの使い分けについて見てみてください。
http://tottocobkhinata.cocolog-nifty.com/bizieizakkicho/2005/08/becausesinceas_fb50.html