N_x(s) = I_x(s)\oplus\bigcup_{r \in R_x,r \neq s}^{} N_x(r)
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Recent Referers:
  1. http://commu-zatsu.hatenablog.com/
  2. http://commu-zatsu.hatenablog.com/entry/2017/04/23/152513
  3. http://blog.hatena.ne.jp/commu_zatsu/commu-zatsu.hatenabl...